Added rest of the sequencing

Assets/Scripts/Counter.cs

@@ -0,0 +1,21 @@
+using UnityEngine;
+using UnityEngine.Events;
+
+public class Counter : MonoBehaviour
+{
+    [SerializeField]
+    private int _count = 0;
+
+    [SerializeField]
+    private int _maxCount = 4;
+
+    [SerializeField]
+    private UnityEvent _onAllDone;
+    
+    public void Count()
+    {
+        _count++;
+        if(_count>=_maxCount)
+            _onAllDone.Invoke();
+    }
+}

Assets/Scripts/Counter.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: e4433a332ec3ad94d94c4ad0c7e5bc28

Assets/Scripts/MusicManager.cs

@@ -0,0 +1,80 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class MusicManager : MonoBehaviour
+{
+    public enum Track
+    {
+        None,
+        Cozy,
+        Trash,
+        TrashPlusBuilding,
+        TurnAround,
+        TurnAroundPlusJeremyLives,
+        FinaleBuildUp,
+    }
+
+    private Track currentTrack = Track.None;
+    private List<AudioSource> currentlyPlaying = new();
+
+    [SerializeField]
+    private AudioSource _CozySource;
+    
+    [SerializeField]
+    private AudioSource _TrashSource;
+    
+    [SerializeField]
+    private AudioSource _AdditiveBuildingSource;
+    
+    [SerializeField]
+    private AudioSource _TurnAroundSource;
+    
+    [SerializeField]
+    private AudioSource _AdditiveJeremyLivesSource;
+    
+    [SerializeField]
+    private AudioSource _FinaleBuildUpSource;
+
+    public void PlayMusic(Track track)
+    {
+        switch (track)
+        {
+            case Track.None:
+                break;
+            case Track.Cozy:
+                break;
+            case Track.Trash:
+                break;
+            case Track.TrashPlusBuilding:
+                break;
+            case Track.TurnAround:
+                break;
+            case Track.TurnAroundPlusJeremyLives:
+                break;
+            case Track.FinaleBuildUp:
+                break;
+            default:
+                throw new ArgumentOutOfRangeException(nameof(track), track, null);
+        }
+    }
+
+    private void Update()
+    {
+        var fadeMultiplier = 0.2f;
+        
+        if(currentTrack == Track.Cozy)
+        {
+            if(!_CozySource.isPlaying)
+                _CozySource.Play();
+
+            _CozySource.volume = Mathf.Clamp(_CozySource.volume + (fadeMultiplier * Time.deltaTime),0,1);
+        }
+        else
+        {
+            _CozySource.volume = Mathf.Clamp(_CozySource.volume - (fadeMultiplier * Time.deltaTime),0,1);
+            if(_CozySource.volume == 0 && _CozySource.isPlaying)
+                _CozySource.Stop();
+        }
+    }
+}

Assets/Scripts/MusicManager.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: d105854c4ef8253498191cabbacf6202

Assets/Scripts/MyButton.cs

@@ -14,7 +14,9 @@ public class MyButton : MonoBehaviour, IPointerClickHandler, IPointerEnterHandle
 
     [SerializeField]
     public bool isActive = true;
-    
+
+    private bool _isPointerOver = false;
+
     public void SetActive(bool active)
     {
         isActive = active;
@@ -36,15 +38,20 @@ public class MyButton : MonoBehaviour, IPointerClickHandler, IPointerEnterHandle
 
     public void OnPointerClick(PointerEventData eventData)
     {
-        if(isActive)
+        if (isActive)
             _onClick.Invoke();
     }
     public void OnPointerEnter(PointerEventData eventData)
     {
-        _outlineFx.enabled = isActive;
+        _isPointerOver = true;
     }
     public void OnPointerExit(PointerEventData eventData)
     {
-        _outlineFx.enabled = false;
+        _isPointerOver = false;
+    }
+
+    private void Update()
+    {
+        _outlineFx.enabled = _isPointerOver && isActive;
     }
 }