Not in a single step.
But if you really want to make it happen...If you put in the background
music and render out the movie as an AVI - then import it again with clip
detection turned off and drag to the timeline, then you can narrate it and
the music is already cooked in, so the track is free.
Emily said:
Can you have backround music for when you record a narration? For
example, can you drag a media file into a "backround music" catagory, and
have the narration playing over it?