8notes.com
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Long-running music education site offering sheet music for dozens of instruments, many pieces free and more with membership, plus beginner lessons, fingering charts, and theory pages. Learners can find graded pieces to practise and look up notes, scales, and chords.
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Modacity
The best practice organisation app: timer, recorder, metronome, drone generator, and deliberate practice guidance grounded in cognitive science. Created by a former Hong Kong Philharmonic horn player. ~£7–10/month.
The Musician's Way by Gerald Klickstein
Klickstein turns deliberate-practice research into concrete routines for musicians: structuring practice sessions, working out interpretation, memorising securely, preparing for performance, managing stage anxiety, and avoiding the injuries that end playing careers.
justinguitar.com
JustinGuitar is a comprehensive online guitar-learning hub offering free video lessons for beginners and beyond. It covers chords, rhythm, technique, scales, and theory, with structured courses and a library of songs.
musictheory.net
Musictheory.net is a free, interactive platform for learning music theory, offering concise lessons on intervals, chords, scales, rhythm, and notation. It also provides hands-on practice with ear training and theory tools to test and reinforce your understanding.
teoria.com
Teoria is an online music theory resource offering interactive lessons, ear-training exercises, and reference materials on scales, intervals, chords, rhythm, and harmony, with musical examples and analyses.
The Bulletproof Musician
Juilliard-trained performance psychologist Noa Kageyama's blog and podcast applying research from sport and cognitive psychology to music. Articles cover effective practice, managing stage fright, focus under pressure and audition preparation, helping performers practise efficiently and play their best when it counts.