musictheory.net
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MusicTheory.net offers free, interactive lessons and exercises that teach core music theory concepts. It covers notation, intervals, scales, chords, rhythm, and provides ear-training and practical practice tools.
More resources on Music Theory
teoria.com
Teoria is an online music theory resource offering interactive lessons on scales, intervals, chords, rhythm, and notation, paired with annotated musical examples. It also provides ear-training exercises and practice quizzes to reinforce concepts.
berklee.edu
Berklee.edu is the official website of Berklee College of Music, offering information on degree programs, admissions, and campus news. It also provides learning resources, articles, and course materials related to music theory, composition, and performance, with links to online courses and educational content.