Function transpose

Transpose a note by an interval.

Example

import { tranpose } from "../core"
transpose("d3", "3M") // => "F#3"
transpose("D", "3M") // => "F#"
["C", "D", "E", "F", "G"].map(pc => transpose(pc, "M3)) // => ["E", "F#", "G#", "A", "B"]
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