Function spellChord

spellChord(chord: ChordData, tonic: NoteLike, key: KeyLike): NoteData[]
Spell a chord's tones, in the chord's own (tertian) order, relative to a key.

Diatonic chords spell exactly (e.g. G7 in C major -> G B D F). Chromatic chord tones take their conventional spelling; enharmonically ambiguous altered tensions may be spelled by the general convention rather than by chord function.

A chord carrying its own tone spellings is spelled by them, since a chord whose letters do not follow from stacking thirds can say so no other way: that is what keeps the German sixth of C major on its F#, the note that resolves outward to the dominant, rather than the Gb a dominant seventh would put there.
Parameters
- chord: ChordData
  The chord.
- tonic: NoteLike
  The spelled tonic of the key, as a note name, a MIDI number, note data, or a Note.
- key: KeyLike
  The key/scale, as a key name, a key/scale, or a Key.
Returns NoteData[]
Spelled chord tones, root first.
Throws
If tonic does not sound the key's root pitch class.
Example
```
import { spellChord, noteNames, parseNote, majorKey, makeChord } from '@libraz/libcantus';
// G7 in C major
noteNames(spellChord(makeChord(7, 'dom7'), parseNote('C'), majorKey(0)));
// ['G', 'B', 'D', 'F']
```
- Defined in src/theory/spelling/index.ts:1032