Skip to content

Understand the piano.

Every chord, every scale, every key — explained, illustrated, and playable. The open reference for the instrument. No login required.

C Major 7C · E · G · B
Open the C Major 7 page →
C
D
E
F
G
A
B
C
D
E
F
G
A
B
Click the keys — or plug in a MIDI keyboard and play. We’ll name what you play and take you to its page.
18Keys
23Chord types
25Scale types
126Mode pages
The index

Any page in two clicks

Pick a key. Pick what you’re looking for. Done.

Chordsevery chord type in this keyC chords →Scalesmajor, minor, pentatonic, blues…C scales →ModesIonian through LocrianC modes →Key signaturesharps, flats, relativesKey of C →Progressionscadences, ii–V–I, pop changesBrowse progressions →
Learn & practice
Chord Finder

Type any chord symbol — see it, hear it, play it on the keyboard.

Open tool →Chord & Scale Mastery

Two editorial series: from your first triad to altered chords and exotic scales.

Start the series →Practice Room

Connect MIDI. Drill chords and scales with real-time feedback that grades how you play.

Enter the room →Circle of Fifths

The interactive map of every key and how they relate.

Explore →
Go deeper
Where should you start?

A short placement assessment maps your skills across 13 domains and recommends exactly what to practice next.

Take the assessment →
Songs, explained

Step-by-step guides to iconic piano pieces — the chords, the technique, the why.

Browse songs →
For creators

Keyframe turns your playing into a beautiful on-stream keyboard overlay for YouTube and Twitch.

See Keyframe →