Preloading external mp3, but shouldnt play until another scene is reached

Hi, newbie here.

im stuck with preloading sounds. i want to preload mp3s into my movie, but the thing is that they shouldnt start playing when completly/partially loaded.

i want the mp3 to get completely loaded in the background(but shouldnt play as yet) .
when some animation is completed and scene 2 is reached the mp3 should start playing.

any clues? i would be very greatful if someone could help me out here.