Apple Music Windows
Fade between songs in Apple Music on Windows
You can set Apple Music to fade in to 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 Apple Music app
on your Windows computer, select the Sidebar Actions button 
at the top of the sidebar, choose Settings, then select Playback.Turn on “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 Duration slider.
When Apple Music plays consecutive tracks from the same album, crossfading is automatically turned off, with no fading between the songs (or tracks).