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Google raising price of YouTube Premium to $13.99 per month
(9to5google.com)
This is a most excellent place for technology news and articles.
I'll check out SmartTube, tho I also rely on Yt Music quite a bit and Yt Prem comes with that as well
ReVanced supports YouTube Music on Android, and it includes the ability to block ads and enable playing music in the background, among other things.