I'd like to have some music playing in the background of my interactive flash movie. How can I keep the music playing continuously even when the user clicks on different buttons and subsequently jumps to different frames?

Also I need the music (an mp3 file) to load in such a way so as not to disrupt the rest of the movie. It's quite a big music file and I'd like the movie to load first and then to 'stream' the sound in as it plays.

Any tips with regards to these 2 questions would be very greatly appreciated : )