Audio from array help !!!

Hi guys i just created this script basically what it is there is a array on the top that is created which holds musics. Now what i want is when i press the GUI button i want the audion to play from the array. I only want it to play Element 0 from the array list

here is my script:

using UnityEngine;
using System.Collections;

public class PlayMusic : MonoBehaviour {

    public AudioClip[] Tracks;

    // Update is called once per frame
    void OnGUI () {

        if (GUI.Button(new Rect(10,20,120,20),"Play Tracks")){

        }

    }
}

thanks for the help in advance :)

you can simply set the audioclip as active clip and play it like this

if (GUI.Button(new Rect(10,20,120,20),"Play Tracks")){
    audio.clip = tracks[0];
    audio.Play();
}