Some good ones posted that I will need to check out. Here's a few random ones that I've been watching lately:
This guy repairs stringed musical instruments, and build them. I'd probably never do a repair or build like this, but I find the techniques, materials and history fascinating. He does a nice job with the production, and a little music thrown in as well:
Rosa String Works
https://www.youtube.com/channel/UC29Dkc6-RMU8TCrloPN0Cbw/videos
-------------------------------------------------------
She is way beyond my playing level, but I hope to pick up a few tips:
Aimee Nolte Music
https://www.youtube.com/channel/UC29Dkc6-RMU8TCrloPN0Cbw/videos
-------------------------------------------------------
Rick is a musician, and producer. He breaks down songs to identify what "makes them great". He has access to the raw tracks, and he will play some individual instruments in isolation, which I find fascinating. His analysis is really insightful.
Rick Beato
https://www.youtube.com/user/pegzch/videos
-------------------------------------------------------
'Fil' features videos of various guitar players, and breaks down their playing. I can strum a few chords, but I find it fascinating to see all the little things that go into some of these playing styles, and he covers the gamut of styles.
Wings of Pegasus
https://www.youtube.com/user/wingsofpegasusTV/videos
-------------------------------------------------------
On the tech side:
Jason does a fast paced, usually simple "white board" style but going into some detail on a different automotive topic in about 10 minutes.
Engineering Explained
https://www.youtube.com/user/EngineeringExplained/videos
-------------------------------------------------------
Like the name says, you will learn something from every video. He's energetic, and does some pretty amazing stuff, often using a super high-speed camera.
SmarterEveryDay
https://www.youtube.com/user/destinws2/videos
-------------------------------------------------------
This one is probably too sleepy/geeky for most, but he really goes into some detail of various tech. Much of it is old tech, and stuff we would see in our everyday lives (toasters, thermostats, etc), and he often covers failed tech, some stuff I recall, others failed before they hit the mainstream.
Technology Connections
https://www.youtube.com/channel/UCy0tKL1T7wFoYcxCe0xjN6Q/videos
-------------------------------------------------------
I've only watched a couple, but they look pretty interesting:
Modern History TV
https://www.youtube.com/channel/UCMjlDOf0UO9wSijFqPE9wBw/videos
-------------------------------------------------------
-ERD50