Fade between songs in Music on Mac
You can set Music to fade in each song (gradually increase its volume) while the previous song is fading out. This feature, called crossfading, prevents gaps of silence between songs.
In the Music app on your Mac, choose Music > Settings, then click Playback.
Select Crossfade Songs.
To change the amount of time it takes for the current song to fade out at the end and the new song to fade in, drag the Seconds slider.
When Music plays consecutive tracks from the same album, crossfading is automatically turned off, with no fading between the songs (or tracks).
To play songs without fading, deselect Crossfade Songs. See Change Playback settings.