songarea = Resources.Load ("Song Name") as AudioClip;
 function OnTriggerEnter (other : Collider)
    {
        {
            if (other.gameObject.tag == "Player")
            {
                Song = object.GetComponent<AudioSource>();
                Song.clip = songarea
                Song.Play();

            }
        }
    }
@script RequireComponent(AudioSource)