Problems with streaming mp3. please help!

hi guys,

i have a button in a movieclip (instance name = mediaplayer) which i want to play an mp3. that button has the following actions applied to it:

on(release){
myMusic.loadSound("soundtrack.mp3", true);
}

however it doesnt work - i dont even get an error message when i test the movie and click on the button.

ive tried…

on(release){
mediaplayer.myMusic.loadSound("soundtrack.mp3", true);
}

…and…

on(release){
myMusic.mediaplayer.loadSound("soundtrack.mp3", true);
}

…but it doesnt work.

ive usd this in other sites before and it has always worked - the only thing im doing differently is that this time the button is in a movieclip.

any suggestions?

many thanks,

mark