Preload music.swf file

I’ve created a flash movie that consists of 2 SWF files, one for the main Flash movie and the other for music only.

In the main movie, I have:
Frame 1-3 - simple percentage preloader
Frame 4 - action: loadMovie(“music.swf”,1); (to trigger the music)
Frame 5 - starts the movie

The problem is, the movie starts before the music plays. The percentage preloader only preloads the main SWF file but not the music file. Is there a way to preload “music.swf” also so when the movie plays, the music will turn on?

I’m a beginner here so any help would be appreciated! Thank you!