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E Major

E — G♯ — B

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From your first chord to jazz harmony. Interactive guides with audio.

Step-by-step guides to iconic piano pieces.

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What Is a Chord?

The complete guide: triads, 7ths, extended — all with interactive keyboards and audio.

What Is an Interval?

14 sections, 9 interactive widgets. Master intervals and ear training.

Hidden Patterns

11 visual patterns that unlock the whole keyboard. See the piano differently.

16 pegs, 12 interactive widgets. Remember every chord shape forever.

Chord Mastery Series

Triads → 7ths → Extended chords. The complete learning path.

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