Synthesia
Synthesia LLC
Guitar Hero for piano — falling coloured notes on a virtual keyboard. One-time £25 purchase. Import any MIDI file for a virtually unlimited song library. Best as a supplement, not a primary method.
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Classical piano simplifications and tutorials for learners not yet at full-grade difficulty. ~790K subscribers.
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Berklee College of Music's free-to-audit piano course — posture, sound production, finger independence, popular cadences, and improvisation. One of 40+ Berklee MOOCs on Coursera.
Paul Barton Piano
2,000+ videos of classical tutorials and full performances from Bangkok. A gentle, patient teaching style with ~700K subscribers. Also known for playing Beethoven for rescue elephants.
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Josh Wright Piano
DMA from University of Michigan, Billboard #1 classical artist. 700+ videos on classical technique with dual camera angles showing exactly how hands move. ~195K–200K subscribers.