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Music TheoryWhere to learn theory online, from free drills to full courses.

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Music Theory

• Douglas Niedt — Guitar Theory & Ear Training

  The basics of music theory, with drills. See also the Ultimate Note Recognition Trainer: Also: douglasniedt.com/ultimate-note-recognition-train

  douglasniedt.comChecked September 2026

• Find any guitar chord

  The app shows several fingerings for any chord in various positions of the fretboard. Click the “Info” symbol and it shows the chord’s name, notational symbols, steps of the scale it is built on, and the notes that comprise the chord. The app is well-designed and easy to use. Recommended.

  all-guitar-chords.comChecked September 2026

• musictheory.net — lessons

  Outstanding explanations and drills to help you learn about music theory. Highly recommended.

  musictheory.netChecked September 2026

• OpenLearn — An Introduction to Music Theory

  An online course.

  open.eduChecked September 2026

• Teoria

  teoria.comChecked September 2026

Coursera and other online learning sites also offer paid music-theory courses if you want something more structured.