Spotify

Emerge
Install Spotify:

Control via MPRIS
MPRISis a D-Bus interface which provides a common API to control media players.

Spotify supports MPRIS.

Prequisites if using a window manager
In, make the window manager start with.

Otherwise, Spotify won't provide an MPRIS interface.

With dbus-send
The most simple approach to controlling Spotify is using.

Play/pause:

Next:

Previous:

With playerctl
Install.

Play/pause:

Next:

Previous:

More info about can be found on its GitHub page.