Use Music Mini Player on Mac
Mini Player takes up very little space on your screen and still lets you adjust the volume, search for songs, choose which songs play next and more.
Mini Player displays the album artwork for the song that’s playing. When you move the pointer over the artwork, controls appear.
You can also shrink the Mini Player window to an even smaller size.
Note: Apple Music, lossless and Dolby Atmos aren’t available in all countries or regions. See the Apple Support article Availability of Apple Media Services.
In the Music app
on your Mac, play music from your library, Apple Music, Apple Music radio, an internet broadcast or a CD.Note: A song needs to be playing before you can use the MiniPlayer.
Choose Window > Switch to MiniPlayer.
If you subscribe to Apple Music, songs available in lossless have the Lossless button
next to them; songs available in Dolby Atmos have the Dolby button 
next to them.Do one of the following:
Shrink to the smaller Mini Player window: In the row of controls, click the More button
, then choose Hide Artwork.To expand back to the full MiniPlayer, click the More button
, then choose Show Artwork.Show lyrics: Click the Lyrics button
.To view the Full Screen Player, click the green button
in the top-left corner of the Mini Player window.View and edit a list of upcoming songs: Click the Playing Next button
in the bottom-right corner of the Mini Player window.Exit MiniPlayer: Click the Close button
in the top-left corner of the MiniPlayer window.
Tip: To quickly open MiniPlayer from the playback controls, click the album artwork.
To keep MiniPlayer in the foreground on your desktop, choose Music > Settings, click Advanced, then select “Keep MiniPlayer on top of all other windows”.