Fade-in/out
Background music that starts and ends gradually is commonly used to create smooth transitions. For each of your music clips, you can click 
and 
to fade-in and fade-out the volume at the start and end of the clip.
Background music that starts and ends gradually is commonly used to create smooth transitions. For each of your music clips, you can click and to fade-in and fade-out the volume at the start and end of the clip.