I'm a huge fan of self-tuition of music on YouTube; there's so much information available now, we really live in a golden age for this. Here are my favorites, with my Top 10 highlighted (**):
Developers with good YouTube channels that go beyond their own products
**
Christian Henson (Spitfire) (perhaps my favorite Music channel on Youtube - great insights, ideas, and generosity to the community)
Paul Thomson (Spitfire)
Troels Folman (8dio)
Project Sam Scoring Tutorials
Orchestral Tools
General Music Production/Orchestration/Composing
**
Ashton Gleckman (incredibly talented and knowledgable; gives detailed walkthroughs and often provides project files to his compositions)
**
Mike Verta (extremely good; interesting and fun to watch; conveys a LOT of information, but his videos are long so you need plenty time)
Alex Moukala
Guy Rowland
ASDR Music Production
Modern Film Composer
iamamusicmogul
Produce Like a Pro
Ashraf El-Zifari
Yuri Wong
Andrew Chellman
MacProVideo
Epikus Composer
Evanant
ThinkSpace
David Das
Music Production Tutorials
Dirk Ehlert
Sonic Academy
Piano Lessons:
**
Bill Hilton (beginner focussed, but clear and informative)
Piano Lessons on the Web
Mangold Project
Jazz Piano School
Guitar Lessons
David Walliman
**
Paul Davids (amazingly talented, fun casual style; great insights that will make you want to practice!)
Bass Guitar Lessons
Talking Bass
Cello
ThatCelloGuy (not instructional, just covers, but wow, can this guy play!)
Accessible Music Theory:
**
Rick Beato (I wouldn't always put him in the 'accessible' category, but he's focussing more on beginner's lately)
**
Signals Music Studio (guitar-based, but general applicability; extremely clear and instantly applicable information)
**
mDecks Music (they make 'Mapping Tonal Harmony Pro' - a great app for music theory)
Jazz Duets
HackMusicTheory
JeffSchneider
Music Matters
Logic
**
MusicTechHelpGuy (exceptionally good/detailed/explained - by far the most comprehensive of any Logic tutor on YouTube)
**
Mikael Baggstrom (quirky presentation, but concise and very useful 'top 5' style tips)
iamamusicmogul
Gear Review:
GearSlutz
Sounds and Gear
Sample Library Reviews
The SampleCast
Sample Library Review
Cory Pelizzari
Hifimidi (guitar VSTs)
Time and Space