If your project has two or more background music clips, you can change the order in which they play in your project.
To change the order of background music clips:
With your project open in the Project browser, choose Clip > Arrange Music Tracks.
The Clip menu appears in a light gray bar across the top of your computer screen.
In the Floating Music Tracks field, drag the song titles to change their order.
Floating music includes any background music that isn’t pinned (attached) to video in your project.
If you want to rearrange a track that you’ve pinned to video, select its title in the Pinned Music Tracks field and click Unpin Track.
The unpinned track reappears in the list of floating music, where you can drag to set its order in the list. After the track is unpinned, it no longer moves with the video it was pinned to.
When you’re satisfied with the arrangement of songs, click OK.