Hi guys, is there a way to find out whether any audio is playing?

var otherClip : AudioClip;

function Update (){
    if (!audio.isPlaying){
        audio.clip = otherClip;
        audio.Play();
    }
}

This works only when the script is attached to the gameobject that contains the audio source. If I want to target to another script in another gameobject, i can do this.

if (gameObject.Find("text01").audio.isPlaying) {

  dosomething();

}

But what i really want is to check if any sort of audio is playing in the scene. It can be playing from any gameobject with a audio source attached. If there a way to check it? Sorry for the long winded question. Trying to get my question across as clear as possible. Thanks guys!!

Rgds, James