how to changes music tracks along with scene changes?

Hi:
i try to use a music manager to control music playing, like one music track matching one scene. i want it to turn the music from one to another automatically when i enter a new scene. i keep the music manager gameobject don’t be destroyed between scenes by using singleton pattern, because i want it to control music volume. this is the code i tried, it doesn’t work, it only keep playing the first track.

public class AudioManager : MonoBehaviour {

    #region Singleton
    private static AudioManager _instance;
    public static AudioManager Instance
    {
        get
        {
            if (_instance==null)
            {
                _instance = GameObject.FindObjectOfType<AudioManager>();
                DontDestroyOnLoad(_instance.gameObject);
            }
            return _instance;
        }
    }
    #endregion

    AudioSource musicPlayer;

    public AudioClip Level01Music;
    public AudioClip Level02Music;
    public AudioClip Level03Music;

   

    private void Awake()
    {
        #region SingletonRun
        if (_instance==null)
        {
            _instance = this;
            DontDestroyOnLoad(this);
        }
        else
        {
            if ( this !=_instance)
            {
                Destroy(this.gameObject);
            }
        }
        #endregion        
    }


    // Use this for initialization
    void Start () {
        musicPlayer = GetComponent<AudioSource>();
        levelMusicPlay();
    
    }
	
	// Update is called once per frame
	void Update () {

	}

    void levelMusicPlay()
    {
        Scene currentScene = SceneManager.GetActiveScene();
        if (currentScene.name== "Level 01")
        {
            if (Level01Music != null)
            {
                musicPlayer.clip = Level01Music;
                musicPlayer.Play();
            }
            else
            {
                Debug.LogWarning("Can not find level01Music");
            }
           
        }

        if (currentScene.name == "Level 02")
        {
            if (Level02Music != null)
            {
                musicPlayer.clip = Level02Music;
                musicPlayer.Play();
            }
            else
            {
                Debug.LogWarning("Can not find level02Music");
            }
        }
        if (currentScene.name == "Level 03")
        {
            if (Level03Music != null)
            {
                musicPlayer.clip = Level03Music;
                musicPlayer.Play();
            }
            else
            {
                Debug.LogWarning("Can not find level03Music");
            }
        }
       
    }
}

is there any way to achieve my goal? Do an audiomixer will help? thank you.

Your music change script is only called the first time the script is loaded. Because you’re not destroying the object carrying the script, it will never be reloaded, and Start() won’t be called. I don’t know why you don’t want it to be destroyed as destroying it would fix your problem of the music not changing. If you want to keep the volume, you could save the state of the music settings, save a “launch parameters” file loaded upon a scene change which will determine what data you’ll load in a new scene. Otherwise, you could get some other game object that is loaded on a new scene which will run musicPlayer.Play on start.