Music in Flash CS3

Hi!
I would like to add music to my flash file. I have added my mp3 to a keyframe on Scene1 in a layer called Music. I would like the music to be played on all my scenes. As it is now the music starts to play again when someone enters Scene1 from another scene. So there is like two instances of the music at the same time. I just want one. I would also like to make a button that turns the music on and off on Scene1. How can this be done?

Please help me out on this one.

Best regards
JoakimN