Notechord

Every note, one you can hear.

All 128 MIDI notes — pitch, frequency and wavelength, every number derived from one formula. Press any key to play it.

C-1C0C1C2C3C4C5C6C7C8C9

Scroll for the full range · press a key to hear its tone and open its note

Now with chords

611 guitar and ukulele chords — notes, formula and fingerings for each, and a strum you can hear.

Browse the chord grid →

All notes

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128 notes · search by name, MIDI number or frequency

Before the frequency

The monochordthe oldest tuning math

One string, one movable bridge. Halve the sounding length and the pitch jumps an octave; stop it at two-thirds and you get a perfect fifth; three-quarters gives a perfect fourth. Those simple whole-number ratios — 2:1, 3:2, 4:3 — are the ones the ear hears as consonant, an observation traditionally credited to Pythagoras. It is the oldest pitch mathematics, and the ancestor of every frequency on this site.

Sounding the whole of the string — a unison (1 : 1, 130.813 Hz).

drag the bridge or use ← → · pluck to hear it

Its open string: C3, 130.813 Hz

From the same deskKeychord— keyboard shortcuts for every app