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G♯ 7♯9The G♯ 7♯9 chord is a five-note chord made up of G♯, B♯, D♯, F♯, and A♯♯.
Piano chords, scales & theory. Full MIDI.
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Today at the piano
Friday, August 21, 2026.
On this day
1904 Count Basie was born in Red Bank, New Jersey.
Term of the day
F Harmonic Minor ScaleThe F Harmonic Minor scale contains seven notes: F, G, A♭, B♭, C, D♭, and E.
Did you know
This reference covers all 18 written keys, including both spellings of every enharmonic pair, C♯ and D♭ alike.
Piano by the numbers ›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 musicNotesAll 88 keys named, A0 to C8, with frequency and enharmonicsVoicingsChord shapes and techniques under the handModesEvery mode, in every key
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