Ahead of WWDC 2019 A few screenshots have emerged that give us a look at the upcoming Music and TV apps to MacOS 10.15.
9to5Mac, the source of these screenshots show us familiar sidebar with gradient and the media player.
Just like on the mobile Apple Music app, it looks like you can browse songs in the new macOS Music app under various categories, such as For You and Radio. The center of the app contains the playback control.