To uninstall cairo-dock-musicplayer-plug-in just follow these instructions.
sudo apt-get remove cairo-dock-musicplayer-plug-in
This will remove just the cairo-dock-musicplayer-plug-in package itself.
sudo apt-get remove --auto-remove cairo-dock-musicplayer-plug-in
This will remove the cairo-dock-musicplayer-plug-in package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for cairo-dock-musicplayer-plug-in then this will work.
sudo apt-get purge cairo-dock-musicplayer-plug-in
Or similarly, like this cairo-dock-musicplayer-plug-in
sudo apt-get purge --auto-remove cairo-dock-musicplayer-plug-in
|Maintainer||Debian Cairo-dock Maintainers <email@example.com>|
|Description||Music player plug-in for Cairo-dock|