You might find this useful if you use Android to watch Youtube. It's an app that allows ad-free viewing, background playing when the app is closed and integrates regular Youtube and Youtube music. It's called NouTube, available on F-Droid from the link below. The app is FOSS(Free Open Source Software) and I've been using it for a while to replace using the Youtube app. Link: https://f-droid.org/en/packages/jp.nonbili.noutube/