Use keyboard shortcuts to control YouTube Music
This browser extension lets you control background playback of YouTube Music (previously known as Google Music) without switching tabs. That is all.
Features:
browser action button
left click toggles playback, context click displays more options
open and pin YouTube Music if it is not open yet
toggle playback: Ctrl+Shift+8
previous song: Ctrl+Shift+9
next song: Ctrl+Shift+0
autoplay when &autoplay=true is found in URL
One can customize default shortcuts via chrome://extensions/configure