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A Add 9The A Add 9 chord is a four-note chord made up of A, C♯, E, and B.
Piano chords, scales & theory. Full MIDI.
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Today at the piano
Monday, August 10, 2026.
On this day
1997 Conlon Nancarrow, who composed the rhythmically intricate Studies for Player Piano, died in Mexico City.
Term of the day
Major b6 Pentatonic ScaleThe major ♭6 pentatonic scale replaces the natural 6th of the major pentatonic with a flat 6th, creating a five-note scale with a darker, more ambiguous color.
Did you know
A standard acoustic or full-size digital piano has 88 keys, spanning A0 to C8.
How many keys does a piano have ›The index
Look anything up directly, in both enharmonic spellings, C♯ and D♭ alike.
ChordsEvery chord type in every key, triads to altered dominantsScalesMajor, minor, pentatonic, blues, bebop and beyondToolsVirtual piano, chord finder, drills, all in the browserTheoryShort articles in teaching order, plus two guided seriesSongsGuides to iconic pieces, and easy songs to start withProgressionsCadences and the progressions behind real musicModesEvery mode, in every keyVoicingsChord shapes and techniques under the hand
Learn and practice
Virtual PianoA keyboard with real sampled sound: mouse, touch, or your computer keys.Play itChord FinderPlay or click any combination of notes and see what chord it makes.Open the toolLearn Piano: the step-by-step pathAn ordered course from your first notes through chords, scales and theory.Follow the pathCircle of FifthsThe interactive wheel: keys, relatives, and how they connect.Explore it