I’ll skip the ones already mentioned.

Anton Petrov - Science and Space news
Postmodern Jukebox - Modern songs in different styles
Legal Eagle - A lawyers take on modern events, movies, etc
Ze Frank - I am unable to describe, just give a video a watch
Anything with Simon Whistler, he has too many channels to list
Munro Live - An engineering firms take on new cars.
nicola white mudlark - Very good if you like history.