teoria.com
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Teoria is an online music theory resource with tutorials on notation, harmony, rhythm, and analysis, plus interactive exercises and ear-training tools. It features a library of musical examples with standard notation, practice quizzes, and guided analyses to reinforce theory concepts.
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The best tuner/metronome combination for musicians — ~£3 one-time purchase. Used by professionals and students alike for intonation training and rhythmic accuracy.
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Improve Your Sight-Reading! Piano, Grade 1 by Paul Harris
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openmusictheory.com
Free textbook with notation section
teoria.com
Exercises for notation reading/writing
musictheory.net
Free interactive notation lessons