Away from bass-only content, this guy is one of my favourites.
Chanan Hanspal (or ‘The Beato of the Valleys’, as I like to refer to him, to no one in particular!) is really good. He does excellent deep dives on the likes of Bowie, Zappa, XTC, The Who, and the Mighty Boosh (?!) amongst others.
A lot of the theory goes over my head, but I find it fun/interesting to watch nonetheless…