diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 4c80941..64509f3 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,6 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools">
+    xmlns:tools="http://schemas.android.com/tools"
+    package="com.example.bcsd_android_2025_1">
+
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.READ_MEDIA_AUDIO" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
 
     <application
         android:allowBackup="true"
@@ -17,10 +23,13 @@
             android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
-
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
-    </application>
+        <service
+            android:name=".MusicPlayerService"
+            android:exported="false"
+            android:foregroundServiceType="mediaPlayback" />
 
+    </application>
 </manifest>
\ No newline at end of file
diff --git a/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt b/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt
index 3ffa0eb..1889f3b 100644
--- a/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt
+++ b/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt
@@ -1,14 +1,191 @@
 package com.example.bcsd_android_2025_1
 
-import android.os.Bundle
-import androidx.activity.enableEdgeToEdge
+import android.Manifest
+import android.content.*
+import android.content.pm.PackageManager
+import android.os.*
+import android.provider.MediaStore
+import android.provider.Settings
+import android.view.View
+import android.widget.*
+import androidx.activity.result.contract.ActivityResultContracts
 import androidx.appcompat.app.AppCompatActivity
-import androidx.core.view.ViewCompat
-import androidx.core.view.WindowInsetsCompat
+import androidx.core.content.ContextCompat
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import android.net.Uri
+import androidx.core.app.ActivityCompat
 
 class MainActivity : AppCompatActivity() {
+
+    private lateinit var recyclerView: RecyclerView
+    private lateinit var permissionLayout: View
+    private lateinit var btnRequestPermission: Button
+    private lateinit var playerLayout: View
+    private lateinit var currentTitle: TextView
+    private lateinit var currentArtist: TextView
+    private lateinit var btnPlayPause: ImageButton
+    private var permissionDeniedCount = 0
+
+
+    private val nowPlayingReceiver = object : BroadcastReceiver() {
+        override fun onReceive(context: Context?, intent: Intent?) {
+            val title = intent?.getStringExtra("title") ?: return
+            val artist = intent.getStringExtra("artist") ?: return
+            val isPlaying = intent.getBooleanExtra("isPlaying", false)
+
+            currentTitle.text = title
+            currentArtist.text = artist
+            btnPlayPause.setImageResource(
+                if (isPlaying) android.R.drawable.ic_media_pause
+                else android.R.drawable.ic_media_play
+            )
+            playerLayout.visibility = View.VISIBLE
+        }
+    }
+
+    private val permissionLauncher = registerForActivityResult(
+        ActivityResultContracts.RequestPermission()
+    ) { isGranted ->
+        if (isGranted) {
+            loadMusicFiles()
+        } else {
+            permissionDeniedCount++
+            if (permissionDeniedCount < 2) {
+                requestPermission()
+            } else {
+                showPermissionLayout()
+            }
+        }
+    }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            ActivityCompat.requestPermissions(
+                this,
+                arrayOf(Manifest.permission.POST_NOTIFICATIONS),
+                100
+            )
+        }
+
+        recyclerView = findViewById(R.id.music_recycler_view)
+        permissionLayout = findViewById(R.id.permission_layout)
+        btnRequestPermission = findViewById(R.id.btn_request_permission)
+        playerLayout = findViewById(R.id.player_layout)
+        currentTitle = findViewById(R.id.text_current_title)
+        currentArtist = findViewById(R.id.text_current_artist)
+        btnPlayPause = findViewById(R.id.button_play_pause)
+
+        btnRequestPermission.setOnClickListener {
+            if (permissionDeniedCount < 2) {
+                requestPermission()
+            } else {
+                val intent = Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS)
+                intent.data = Uri.fromParts("package", packageName, null)
+                startActivity(intent)
+            }
+        }
+
+        btnPlayPause.setOnClickListener {
+            val intent = Intent("com.example.bcsd_android_2025_1.ACTION_TOGGLE_PLAY")
+            sendBroadcast(intent)
+        }
+
+        if (isPermissionGranted()) {
+            loadMusicFiles()
+        } else {
+            showPermissionLayout()
+            requestPermission()
+        }
+    }
+
+    override fun onResume() {
+        super.onResume()
+        registerReceiver(
+            nowPlayingReceiver,
+            IntentFilter("com.example.bcsd_android_2025_1.NOW_PLAYING"),
+            RECEIVER_NOT_EXPORTED
+        )
+
+        sendBroadcast(Intent("com.example.bcsd_android_2025_1.REQUEST_NOW_PLAYING"))
+    }
+
+    override fun onPause() {
+        super.onPause()
+        unregisterReceiver(nowPlayingReceiver)
+    }
+
+    private fun isPermissionGranted(): Boolean {
+        val permission = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            Manifest.permission.READ_MEDIA_AUDIO
+        } else {
+            Manifest.permission.READ_EXTERNAL_STORAGE
+        }
+        return ContextCompat.checkSelfPermission(this, permission) == PackageManager.PERMISSION_GRANTED
+    }
+
+    private fun requestPermission() {
+        val permission = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            Manifest.permission.READ_MEDIA_AUDIO
+        } else {
+            Manifest.permission.READ_EXTERNAL_STORAGE
+        }
+        permissionLauncher.launch(permission)
+    }
+
+    private fun showPermissionLayout() {
+        recyclerView.visibility = View.GONE
+        permissionLayout.visibility = View.VISIBLE
+    }
+
+    private fun loadMusicFiles() {
+        recyclerView.visibility = View.VISIBLE
+        permissionLayout.visibility = View.GONE
+
+        val musicList = mutableListOf<Music>()
+        val uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI
+        val projection = arrayOf(
+            MediaStore.Audio.Media._ID,
+            MediaStore.Audio.Media.TITLE,
+            MediaStore.Audio.Media.ARTIST,
+            MediaStore.Audio.Media.DURATION
+        )
+
+        val cursor = contentResolver.query(
+            uri,
+            projection,
+            MediaStore.Audio.Media.IS_MUSIC + "!= 0",
+            null,
+            null
+        )
+
+        cursor?.use {
+            val idIdx = it.getColumnIndexOrThrow(MediaStore.Audio.Media._ID)
+            val titleIdx = it.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE)
+            val artistIdx = it.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST)
+            val durationIdx = it.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION)
+
+            while (it.moveToNext()) {
+                val id = it.getLong(idIdx)
+                val contentUri = ContentUris.withAppendedId(uri, id)
+                val title = it.getString(titleIdx) ?: "Unknown"
+                val artist = it.getString(artistIdx) ?: "Unknown"
+                val duration = it.getLong(durationIdx)
+                musicList.add(Music(title, artist, duration, contentUri))
+            }
+        }
+
+        recyclerView.layoutManager = LinearLayoutManager(this)
+        recyclerView.adapter = MusicAdapter(musicList) { selectedMusic ->
+            val serviceIntent = Intent(this, MusicPlayerService::class.java).apply {
+                putExtra(MusicPlayerService.EXTRA_MUSIC_URI, selectedMusic.uri)
+                putExtra(MusicPlayerService.EXTRA_TITLE, selectedMusic.title)
+                putExtra(MusicPlayerService.EXTRA_ARTIST, selectedMusic.artist)
+            }
+            startForegroundService(serviceIntent)
+        }
     }
-}
\ No newline at end of file
+}
diff --git a/app/src/main/java/com/example/bcsd_android_2025_1/Music.kt b/app/src/main/java/com/example/bcsd_android_2025_1/Music.kt
new file mode 100644
index 0000000..829b5d1
--- /dev/null
+++ b/app/src/main/java/com/example/bcsd_android_2025_1/Music.kt
@@ -0,0 +1,10 @@
+package com.example.bcsd_android_2025_1
+
+import android.net.Uri
+
+data class Music(
+    val title: String,
+    val artist: String,
+    val duration: Long,
+    val uri: Uri
+)
diff --git a/app/src/main/java/com/example/bcsd_android_2025_1/MusicAdapter.kt b/app/src/main/java/com/example/bcsd_android_2025_1/MusicAdapter.kt
new file mode 100644
index 0000000..4f3a793
--- /dev/null
+++ b/app/src/main/java/com/example/bcsd_android_2025_1/MusicAdapter.kt
@@ -0,0 +1,43 @@
+package com.example.bcsd_android_2025_1
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.recyclerview.widget.RecyclerView
+
+class MusicAdapter(
+    private val musicList: List<Music>,
+    private val onItemClick: (Music) -> Unit
+) : RecyclerView.Adapter<MusicAdapter.MusicViewHolder>() {
+
+    class MusicViewHolder(view: View) : RecyclerView.ViewHolder(view) {
+        val title: TextView = view.findViewById(R.id.title_text)
+        val artist: TextView = view.findViewById(R.id.artist_text)
+        val duration: TextView = view.findViewById(R.id.duration_text)
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MusicViewHolder {
+        val view = LayoutInflater.from(parent.context)
+            .inflate(R.layout.item_music, parent, false)
+        return MusicViewHolder(view)
+    }
+
+    override fun onBindViewHolder(holder: MusicViewHolder, position: Int) {
+        val music = musicList[position]
+        holder.title.text = music.title
+        holder.artist.text = music.artist
+        holder.duration.text = formatDuration(music.duration)
+        holder.itemView.setOnClickListener { onItemClick(music) }
+    }
+
+    override fun getItemCount(): Int = musicList.size
+
+    private fun formatDuration(durationMs: Long): String {
+        val seconds = durationMs / 1000 % 60
+        val minutes = durationMs / (1000 * 60) % 60
+        val hours = durationMs / (1000 * 60 * 60)
+        return if (hours > 0) "%d:%02d:%02d".format(hours, minutes, seconds)
+        else "%02d:%02d".format(minutes, seconds)
+    }
+}
diff --git a/app/src/main/java/com/example/bcsd_android_2025_1/MusicPlayerService.kt b/app/src/main/java/com/example/bcsd_android_2025_1/MusicPlayerService.kt
new file mode 100644
index 0000000..23f5317
--- /dev/null
+++ b/app/src/main/java/com/example/bcsd_android_2025_1/MusicPlayerService.kt
@@ -0,0 +1,142 @@
+package com.example.bcsd_android_2025_1
+
+import android.app.*
+import android.content.*
+import android.media.MediaPlayer
+import android.net.Uri
+import android.os.IBinder
+import androidx.core.app.NotificationCompat
+import android.os.Build
+
+
+class MusicPlayerService : Service() {
+
+    private var mediaPlayer: MediaPlayer? = null
+    private var currentTitle: String = ""
+    private var currentArtist: String = ""
+
+    companion object {
+        const val CHANNEL_ID = "MusicPlayerChannel"
+        const val EXTRA_MUSIC_URI = "music_uri"
+        const val EXTRA_TITLE = "music_title"
+        const val EXTRA_ARTIST = "music_artist"
+    }
+
+    private val commandReceiver = object : BroadcastReceiver() {
+        override fun onReceive(context: Context?, intent: Intent?) {
+            when (intent?.action) {
+                "com.example.bcsd_android_2025_1.ACTION_TOGGLE_PLAY" -> {
+                    if (mediaPlayer?.isPlaying == true) {
+                        mediaPlayer?.pause()
+                    } else {
+                        mediaPlayer?.start()
+                    }
+                    broadcastNowPlaying()
+                }
+                "com.example.bcsd_android_2025_1.REQUEST_NOW_PLAYING" -> {
+                    broadcastNowPlaying()
+                }
+            }
+        }
+    }
+
+    override fun onCreate() {
+        super.onCreate()
+        createNotificationChannel()
+        val filter = IntentFilter().apply {
+            addAction("com.example.bcsd_android_2025_1.ACTION_TOGGLE_PLAY")
+            addAction("com.example.bcsd_android_2025_1.REQUEST_NOW_PLAYING")
+        }
+        registerReceiver(commandReceiver, filter)
+    }
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        intent?.let {
+            val musicUri = it.getParcelableExtra<Uri>(EXTRA_MUSIC_URI)
+            currentTitle = it.getStringExtra(EXTRA_TITLE) ?: "Unknown"
+            currentArtist = it.getStringExtra(EXTRA_ARTIST) ?: "Unknown"
+
+            musicUri?.let { uri ->
+                playMusic(uri)
+            }
+        }
+        return START_STICKY
+    }
+
+    private fun playMusic(uri: Uri) {
+        mediaPlayer?.release()
+        try {
+            val fd = contentResolver.openFileDescriptor(uri, "r")?.fileDescriptor
+            if (fd != null) {
+                mediaPlayer = MediaPlayer().apply {
+                    setDataSource(fd)
+                    prepare()
+                    start()
+                }
+                showNotification()
+                broadcastNowPlaying()
+            } else {
+                stopSelf()
+            }
+        } catch (e: Exception) {
+            e.printStackTrace()
+            stopSelf()
+        }
+    }
+
+
+    private fun showNotification() {
+        val openAppIntent = Intent(this, MainActivity::class.java).apply {
+            flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TOP
+        }
+
+        val pendingIntent = PendingIntent.getActivity(
+            this,
+            0,
+            openAppIntent,
+            PendingIntent.FLAG_IMMUTABLE or PendingIntent.FLAG_UPDATE_CURRENT
+        )
+
+        val notification = NotificationCompat.Builder(this, CHANNEL_ID)
+            .setContentTitle(currentTitle)
+            .setContentText(currentArtist)
+            .setSmallIcon(android.R.drawable.ic_media_play)
+            .setOngoing(true)
+            .setContentIntent(pendingIntent)
+            .build()
+
+        startForeground(1, notification)
+    }
+
+    private fun broadcastNowPlaying() {
+        val isPlaying = mediaPlayer?.isPlaying == true
+        val intent = Intent("com.example.bcsd_android_2025_1.NOW_PLAYING").apply {
+            putExtra("title", currentTitle)
+            putExtra("artist", currentArtist)
+            putExtra("isPlaying", isPlaying)
+        }
+        sendBroadcast(intent)
+    }
+
+    override fun onDestroy() {
+        mediaPlayer?.release()
+        unregisterReceiver(commandReceiver)
+        super.onDestroy()
+    }
+
+    override fun onBind(intent: Intent?): IBinder? = null
+
+    private fun createNotificationChannel() {
+        val channel = NotificationChannel(
+            CHANNEL_ID,
+            "음악 재생 채널",
+            NotificationManager.IMPORTANCE_LOW
+        ).apply {
+            description = "음악 재생 상태를 보여주는 채널"
+        }
+
+        val manager = getSystemService(NotificationManager::class.java)
+        manager?.createNotificationChannel(channel)
+    }
+
+}
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 311f3cb..064a884 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,19 +1,83 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:id="@+id/main"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    tools:context=".MainActivity">
+    android:layout_height="match_parent">
 
-    <TextView
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/music_recycler_view"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:visibility="gone"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"/>
+
+    <LinearLayout
+        android:id="@+id/permission_layout"
+        android:orientation="vertical"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello Android!"
+        android:gravity="center"
+        android:visibility="gone"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent">
+
+        <TextView
+            android:text="@string/permission_message"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"/>
+
+        <Button
+            android:id="@+id/btn_request_permission"
+            android:text="@string/request_permission_button"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"/>
+    </LinearLayout>
+
+    <LinearLayout
+        android:id="@+id/player_layout"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal"
+        android:gravity="center_vertical"
+        android:padding="12dp"
+        android:background="#EEEEEE"
+        android:visibility="gone"
         app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintEnd_toEndOf="parent">
+
+        <LinearLayout
+            android:orientation="vertical"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1">
+
+            <TextView
+                android:id="@+id/text_current_title"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:textStyle="bold"
+                android:text="@string/default_title" />
+
+            <TextView
+                android:id="@+id/text_current_artist"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/default_artist" />
+        </LinearLayout>
 
+        <ImageButton
+            android:id="@+id/button_play_pause"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:background="?attr/selectableItemBackgroundBorderless"
+            android:contentDescription="@string/play_pause_button_description"
+            android:src="@android:drawable/ic_media_play" />
+    </LinearLayout>
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/item_music.xml b/app/src/main/res/layout/item_music.xml
new file mode 100644
index 0000000..64d83fb
--- /dev/null
+++ b/app/src/main/res/layout/item_music.xml
@@ -0,0 +1,36 @@
+<androidx.constraintlayout.widget.ConstraintLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:padding="12dp">
+
+    <TextView
+        android:id="@+id/title_text"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:textStyle="bold"
+        android:textSize="16sp"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent" />
+
+    <TextView
+        android:id="@+id/artist_text"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:textSize="14sp"
+        app:layout_constraintTop_toBottomOf="@id/title_text"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toStartOf="@id/duration_text"
+        android:layout_marginTop="4dp"/>
+
+    <TextView
+        android:id="@+id/duration_text"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:textSize="12sp"
+        app:layout_constraintTop_toTopOf="@id/artist_text"
+        app:layout_constraintBottom_toBottomOf="@id/artist_text"
+        app:layout_constraintEnd_toEndOf="parent"/>
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index c8524cd..bbc5fd8 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -2,4 +2,5 @@
 <resources>
     <color name="black">#FF000000</color>
     <color name="white">#FFFFFFFF</color>
+    <color name="purple">#8E28FF</color>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index c6c4daf..dbfb37c 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,8 @@
 <resources>
-    <string name="app_name">BCSD_Android_2025-1</string>
+    <string name="app_name">My Appliction</string>
+    <string name="permission_message">파일을 보려면 권한을 허용해야 합니다.</string>
+    <string name="request_permission_button">설정으로 이동</string>
+    <string name="default_title">제목 없음</string>
+    <string name="default_artist">가수 없음</string>
+    <string name="play_pause_button_description">재생 또는 일시정지</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
index 5f61f69..00f5b00 100644
--- a/app/src/main/res/values/themes.xml
+++ b/app/src/main/res/values/themes.xml
@@ -1,8 +1,7 @@
 <resources xmlns:tools="http://schemas.android.com/tools">
-    <!-- Base application theme. -->
-    <style name="Base.Theme.BCSD_Android_20251" parent="Theme.Material3.DayNight.NoActionBar">
-        <!-- Customize your light theme here. -->
-        <!-- <item name="colorPrimary">@color/my_light_primary</item> -->
+    <style name="Base.Theme.BCSD_Android_20251" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+        <item name="colorPrimary">@color/purple</item>
+        <item name="colorOnPrimary">@android:color/white</item>
     </style>
 
     <style name="Theme.BCSD_Android_20251" parent="Base.Theme.BCSD_Android_20251" />