Transition to new audio through a GUI Button?

using System.Collections; using System.Collections.Generic; using UnityEngine;

public class OnCollision : MonoBehaviour { public Transform other; public GUIStyle style; public GameObject crate; public GameObject GameObject1;

 void OnGUI()
 {
     if (other)
     {
         float dist = Vector3.Distance(other.position, transform.position);
         if(dist < 20 )
         {
             if (GUI.Button (new Rect (600, 100, 100, 100), "NO")) {
                 Destroy(crate);
                 Destroy(GameObject1);

             }
             GUI.Button(new Rect(800, 100, 100, 100),"YES");
             GUI.TextArea(new Rect (600, 250, 300, 100), "Do You Want To Open This Crate?", style);
         
             }
         }
     }

}

I have this code. When the "YES" button is clicked, I want a new audio to start playing other than the main game audio. How can I implement it into this code?