This site has many free music theory lessons, covering theory topics like note reading and clefs, duration and rhythm, time signatures, major scales, key signatures, triads and chord spelling, seventh chords, lead sheet symbols, and many more. We also have lessons on advanced music theory topics like mode mixture, secondary dominants, neapolitan chords, augmented sixth chords, the ALT chord in jazz, set theory, and even twelve-tone serialism.

Check out our free music theory book and dozens of free online music theory quizzes. If you're new to music theory, start with Chapter 1: Music Theory Fundamentals. Thanks for visiting! Please tell others about these great music theory resources.