Button not working but other buttons are working. HELP

Need Help..I was following a tutorial about how to pause a background music that will remember if it was paused or not in other scenes.

This is the link to the tutorial i followed..I followed everything but it doesnt seem to work https://www.youtube.com/watch?v=OeZuwgG6HJM&t=300s

But this button is not working at all but other buttons is working fine. There was no errors when I try to run it.

this is the code for the button:

public class musicButton : MonoBehaviour {

 private backgroundMusicScript music;
 public Button MusicButton;
 public Sprite onMusic;
 public Sprite offMusic;


 void Start () {
     music = GameObject.FindObjectOfType<backgroundMusicScript> ();
     UpdateIconandVolume ();
 }

 public void PauseMusic ()
 {
     music.ToggleMusic();
     UpdateIconandVolume ();
 }

 void UpdateIconandVolume ()
 {
     if (PlayerPrefs.GetInt ("Music", 0) == 0) {
         AudioListener.volume = 1;
         MusicButton.GetComponent<Image> ().sprite = onMusic;
     } else {
         AudioListener.volume = 0;
         MusicButton.GetComponent<Image> ().sprite = offMusic;
     }
 }

}

and heres the code for the background music to not destroy and the toggle music:

public class backgroundMusicScript : MonoBehaviour {

 public void Awake ()
 {
     GameObject[] objs = GameObject.FindGameObjectsWithTag ("BG-Music");
     if (objs.Length > 1)
         Destroy (this.gameObject);

     DontDestroyOnLoad (this.gameObject);
 }

 public void ToggleMusic ()
 {
     if (PlayerPrefs.GetInt ("Muted", 0) == 0) {
         PlayerPrefs.SetInt ("Muted", 1); //set the music to 1
     } else {
         PlayerPrefs.SetInt ("Muted", 0); //set the music to 0
     }
 }

}

[1]: https://www.youtube.com/watch?v=OeZuwgG6HJM&t=300s