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A piano reference: chords, scales, theory & ear training.

Piano chords, scales, theory & ear training

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Today at the piano

Saturday, July 25, 2026. The Library resets daily: a featured page, a term, and a note of piano history, drawn from the same reference every deep page uses.

Featured page

G Minor 9th

The G Minor 9th chord is a five-note chord made up of G, B♭, D, F, and A.

On this day

1883 Alfredo Casella, an Italian composer, pianist and conductor, was born in Turin.

Did you know

The lowest key on the piano (A0) sounds at 27.5 Hz; the highest (C8) at about 4,186 Hz.

Piano by the numbers

Jump to any reference page

Chords, scales, and modes — every key, both enharmonic spellings.

The index

Look anything up directly, in both enharmonic spellings, C♯ and D♭ alike.

Learn and practice

The reference is for looking things up; these are for getting better.

Who writes this

Justin Evans at the piano

Maintained on nights and weekends by Justin Evans, a pianist of 25 years. Report a mistake