Added 3 (!) diff musics

Assets/Prefabs/Ambiance.prefab

@@ -45,7 +45,7 @@ AudioSource:
     type: 2}
   m_audioClip: {fileID: 8300000, guid: 5e6a6f173f280dd48b74eb4bd1b9a32c, type: 3}
   m_PlayOnAwake: 1
-  m_Volume: 0.2
+  m_Volume: 0.3
   m_Pitch: 1
   Loop: 1
   Mute: 0

Assets/Prefabs/GameController.prefab

@@ -133,6 +133,9 @@ MonoBehaviour:
   startScene: MainMenu
   mainScene: LevelDesign
   endScene: ThanksScene
+  startMusic: {fileID: 8300000, guid: ca051ddfd9879bb4783087293eb7e5a4, type: 3}
+  mainMusic: {fileID: 8300000, guid: 3db8d9d52151c604c8b9d225f66dfed4, type: 3}
+  endMusic: {fileID: 8300000, guid: b770b78ed34b52b4f8891f25bb674320, type: 3}
   fadeSpeed: 2.5
   fadeImg: {fileID: 3902665078773332606}
   coinText: {fileID: 3994057406749197163}
@@ -147,7 +150,7 @@ AudioSource:
   serializedVersion: 4
   OutputAudioMixerGroup: {fileID: 24300002, guid: de87b833901494b4c90efb705ec209f6,
     type: 2}
-  m_audioClip: {fileID: 8300000, guid: ca051ddfd9879bb4783087293eb7e5a4, type: 3}
+  m_audioClip: {fileID: 8300000, guid: 3db8d9d52151c604c8b9d225f66dfed4, type: 3}
   m_PlayOnAwake: 1
   m_Volume: 0.436
   m_Pitch: 1

Assets/Scripts/GameController.cs

@@ -11,11 +11,14 @@ public class GameController : MonoBehaviour
     [SerializeField]
     private string startScene, mainScene, endScene;
     [SerializeField]
+    private AudioClip startMusic, mainMusic, endMusic;
+    [SerializeField]
     private float fadeSpeed;
     [SerializeField]
     private Image fadeImg;
     [SerializeField]
     private TMP_Text coinText;
+    private AudioSource audioSource;
     private Coroutine fadeCoroutine;
     private int coinAmount = 0;
     public int CoinAmount{get=>coinAmount;}
@@ -37,6 +40,7 @@ public class GameController : MonoBehaviour
             }else{
                 coinText.gameObject.SetActive(true);
             }
+            audioSource = GetComponent<AudioSource>();
         }else{
             Destroy(this.gameObject);
         }
@@ -100,6 +104,18 @@ public class GameController : MonoBehaviour
                 fadeImg.color = imgColor;
                 yield return null;
             }
+            string active = SceneManager.GetActiveScene().name;
+            if(active.Equals(startScene)){
+                audioSource.clip = startMusic;
+                audioSource.Play();
+            }else if(active.Equals(mainScene)){
+                audioSource.clip = mainMusic;
+                audioSource.Play();
+            }else if(active.Equals(endScene)){
+                audioSource.clip = endMusic;
+                audioSource.Play();
+            }   
+            
         }
     }
 }

Assets/Sounds/Victory.mp3.meta

@@ -0,0 +1,22 @@
+fileFormatVersion: 2
+guid: b770b78ed34b52b4f8891f25bb674320
+AudioImporter:
+  externalObjects: {}
+  serializedVersion: 6
+  defaultSettings:
+    loadType: 0
+    sampleRateSetting: 0
+    sampleRateOverride: 44100
+    compressionFormat: 1
+    quality: 1
+    conversionMode: 0
+  platformSettingOverrides: {}
+  forceToMono: 0
+  normalize: 1
+  preloadAudioData: 1
+  loadInBackground: 0
+  ambisonic: 0
+  3D: 1
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Sounds/a-robust-crew.mp3.meta

@@ -0,0 +1,22 @@
+fileFormatVersion: 2
+guid: 3db8d9d52151c604c8b9d225f66dfed4
+AudioImporter:
+  externalObjects: {}
+  serializedVersion: 6
+  defaultSettings:
+    loadType: 0
+    sampleRateSetting: 0
+    sampleRateOverride: 44100
+    compressionFormat: 1
+    quality: 1
+    conversionMode: 0
+  platformSettingOverrides: {}
+  forceToMono: 0
+  normalize: 1
+  preloadAudioData: 1
+  loadInBackground: 0
+  ambisonic: 0
+  3D: 1
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: