musictheory.net
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MusicTheory.net provides free, concise music theory lessons and interactive exercises on chords, harmony, scales, intervals, and rhythm, with practical tools like a piano keyboard, interval ear trainer, and chord progression builder.
More resources on Chords & Harmony
Jazz Improvisation (Gary Burton / Berklee / Coursera)
Gary Burton brings Berklee's core jazz curriculum to anyone with an internet connection — free to audit. Covers jazz improvisation foundations and chord-scale relationships.
Charles Cornell
Purchase College jazz piano graduate combining comedy with genuine music education. His '5 Versions' series makes reharmonisation and chord substitution surprisingly accessible. ~1.4M subscribers.
Aimee Nolte Music
Uniquely combines jazz piano with vocal and scat education — ii–V–I tutorials and standard analysis from real performance experience. ~300K+ subscribers.
Jazz Tutorial with Julian Bradley
The most comprehensive free jazz piano education on YouTube — voicings, improvisation, and jazz scales with a structured step-by-step approach. Master's in music composition. ~418K subscribers.
Bill Hilton Piano
One of the longest-running piano channels (since 2008) — the go-to for chord-based playing, cocktail jazz, and improvisation. Calm British teaching style. ~429K subscribers. Start here for lead-sheet playing.
PianoGroove
Structured jazz piano instruction online — one of the most comprehensive resources for adults learning jazz harmony and voicings at the keyboard.