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🎹 Piano & Chords
Two octaves you can actually play — mouse, touch or your computer keyboard. Pick any chord or scale and its shape lights up on the keys with the interval formula, one tap plays it; the circle of fifths shows which keys are neighbours. Includes the Vietnamese pentatonic scales.
Circle of fifths
A major chord stacks intervals 1-3-5 (4+3 semitones), a minor chord flips it to 1-♭3-5 (3+4). Neighbouring keys on the circle of fifths share 6 of 7 notes — that's why G and F feel so close to C. The pentatonic scale drops the two “tense” notes, which is why it never sounds wrong.