Install cairo-dock-musicplayer-plug-in by entering the following commands in the terminal:
sudo apt update sudo apt install cairo-dock-musicplayer-plug-in
Music player plug-in for Cairo-dock
A collection of official plug-ins and applets for cairo-dock. . This plug-in lets you control any music player. The User can drag and drop songs on the icon to put them in the queue (depends on the player).