5 Services from music.openverbs.com

Builds a musical scale from a root note and scale type, returning note names, MIDI numbers, and semitone intervals

Builds a chord from a root note and quality, returning note names, MIDI numbers, and semitone intervals spelled by stacked thirds.

Names the musical interval between two notes, returning semitone count, diatonic number, and quality (perfect/major/minor/augmented/diminished) with correct enharmonic spelling awareness.

Parses a note in scientific pitch notation (e.g. 'A4', 'C#5', 'Bb3') into its letter, accidental, pitch class (0–11), octave, MIDI number, and frequency in Hz.

Transposes a musical note up or down by a specified number of semitones, returning the result spelled with sharps or flats.