# Chord dictionary (appendix)

Interactive version: [`chord-dictionary.html`](chord-dictionary.html). Part of
[Theory and Practice](theory.md).

Every chord type — transposed to all twelve keys. Each **chord is a row** and its **notes are laid
out in columns** (lowest first: 1, 2, 3, …), with a **mini-keyboard** on the right showing the exact
keys to press. On the interactive page, click any row to hear it (with an optional
**roll/arpeggiate** toggle), or filter the table to a single key. Note spellings use sharps, matching
the [chord types](chord-types.md) tables.

Looking for how each chord is *built* — its degrees, feel, and category (triads, 7ths, extended,
altered, …)? That's on the [All chord types](chord-types.md) page. This page is the big reference.

## What's in it

For each of the 12 roots (C, C♯, D, … B), the dictionary lists every chord type from the
[chord types](chord-types.md) page:

- **Triads** — major, minor, diminished, augmented
- **Suspended & power** — sus2, sus4, 5
- **Sixths** — 6, m6
- **Sevenths** — maj7, 7, m7, m7♭5, °7, mMaj7, 7♯5
- **Extended** — 9, maj9, m9, 11, 13
- **Added-tone** — add9, 6/9, m(add9)
- **Altered dominants** — 7♭9, 7♯9, 7♯11, 7♭13

To spell any chord in any key by hand, take its **On C** notes from the
[chord types](chord-types.md) tables and transpose every note up by the same number of half-steps as
the new root (e.g. Dm7 = Cm7 up two half-steps — D F A C).

## Grid view (chords × keys)

At the bottom of the interactive page there's a second layout of the same data: **chord types down the
rows, all twelve keys across the columns**, with each cell holding that chord's notes spelled correctly
for its key (so E13 reads E G♯ D F♯ C♯, not E A♭ D F♯ D♭). Click any cell to hear the chord in that key.
It's a dense sideways-scrolling lookup grid — handy for comparing one chord across every key at a glance.