Playing a mp3 when a movie clip loads

i using adobe flash professional cs6

 

what trying play mp3 file have in library when clip loads , stop playing when new clip selected menu created.  on button loads movie clip (instance name: slideshow), have following code:

[code]

on (release){

    gotoandplay(120);

}

onclipevent (load){

    mysong = new sound();

    mysong.attachsound("mastersthishall");

    mysong.start(0,50);

}

onclipevent (unload) {

    mysong.stop();

}

[/code]

- went properties of mastersthishall.mp3 file in library,

- selected "actionscript", tab,

- checked box says "export actionscript",

- unchecked "export in frame 1" check box, and

- added mastersthishall in "identifier" field.

 

the sound not playing when when "slideshow" button pressed.

 

ideas?

attach code main timeline:

 

mysong = new sound(this);

   mysong.attachsound("mastersthishall");

    mysong.start(0,50);

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