Function isScaleTone

isScaleTone(pitch: number, key: KeyLike): boolean
Test whether a pitch belongs to the scale.
Parameters
- pitch: number
  MIDI pitch or bare pitch class.
- key: KeyLike
  The key/scale to test against, as a key name, a key/scale, or a Key.
Returns boolean
True if the pitch class is a member of the scale.
Example
```
import { majorKey, isScaleTone } from '@libraz/libcantus';
const key = majorKey(0); // C major
isScaleTone(64, key); // true — E is in C major
isScaleTone(61, key); // false — C# is not
```
- Defined in src/theory/scale/degrees.ts:34