# piano.org

> A piano reference: every chord, scale, mode, and key — explained, illustrated, and playable, with no login required. Built to teach how music works, not just what to play.

piano.org covers 18 keys, 43 chord types, 25 scale types, and 126 modes. Each reference page includes an interactive keyboard diagram, audio playback, fingering charts, and staff notation, alongside theory lessons and MIDI-based practice tools. Individual chord, scale, and mode pages live under the hubs below and are linked from them; this file lists the hubs and flagship resources rather than every page.

## Reference hubs

- [Chords](https://piano.org/chords/): All 43 chord types, each shown in every one of the 18 keys with diagrams, audio, and fingering.
- [Scales](https://piano.org/scales/): All 25 scale types — major, minor, pentatonic, blues, and more — in every key.
- [Modes](https://piano.org/modes/): 126 mode pages, Ionian through Locrian, across all keys.
- [Notes](https://piano.org/notes/): All 88 piano keys named, A0 to C8 — each highlighted on an interactive keyboard with frequency, octave, and enharmonics.
- [Voicings](https://piano.org/voicings/): Rootless and fixed-shape jazz piano voicings — how to arrange chord tones at the keyboard.
- [Chord progressions](https://piano.org/chord-progressions/): Common cadences, ii–V–I, and pop changes with voice-leading explained.
- [Theory](https://piano.org/theory/): Lessons on intervals, chord construction, scales, and harmony.
- [Songs](https://piano.org/songs/): Step-by-step breakdowns of iconic piano pieces — the chords, the technique, and the why.

## Browse by key

- [Key pages](https://piano.org/key/c/): Each key's signature, sharps/flats, relatives, chords, scales, and modes. Swap the key in the URL (e.g. /key/g/) for any of the 18 keys.

## Interactive tools

- [What Am I Playing?](https://piano.org/tools/what-am-i-playing/): Play on MIDI, click, or type and get the name live — notes, intervals, chords with inversions, scales, and modes, with staff notation.
- [Chord Finder](https://piano.org/tools/chord-finder/): Type any chord symbol to see it, hear it, and view it on the keyboard.
- [Practice Room](https://piano.org/tools/practice-room/): Connect a MIDI keyboard and drill chords and scales with real-time feedback that grades your playing.
- [Circle of Fifths](https://piano.org/tools/circle-of-fifths/): An interactive map of every key and how they relate.
- [Placement assessment](https://piano.org/tools/diagnostic/): A short diagnostic that maps your skills across 13 domains and recommends what to practice next.
- [All tools](https://piano.org/tools/): The full set of interactive tools.

## Learn

- [Chord & Scale Mastery](https://piano.org/theory/what-is-a-chord/): Two editorial series, from your first triad through altered chords and exotic scales.
- [Voice leading](https://piano.org/theory/voice-leading/): Why progressions sound smooth — common tones and minimal motion between chords.

## About

- [About piano.org](https://piano.org/about/): What the project is and the approach behind it.
- [Keyframe for creators](https://piano.org/creators/): Turn your playing into an on-stream keyboard overlay for YouTube and Twitch.
- [Piano Deck](https://piano.org/piano-deck/): The piano.org flashcard system.

## Optional

- [Sitemap](https://piano.org/sitemap-page/): Full list of pages.
- [Gear](https://piano.org/gear/): Recommended equipment.
- [Contact](https://piano.org/contact/): Get in touch.