Tonic

Swift library for music theory, currently focused on chords/harmony.

Tonic answers musical questions, such as:

What's the note for this pitch in this key?

Note(pitch: Pitch(midiNoteNumber), key: .Bb)
What's the name of a chord?

Chord(notes: notes).description
What chords are in this key?

Key.Cm.chords
What chords in this key contain this note?

Key.C.chords.filter { $0.noteClasses.contains(.C) }
What notes do these keys have in common?

Key.C.noteSet.intersection(Key.Cm.noteSet)
What notes don't these keys have in common?

Key.C.noteSet.symmetricDifference(Key.Cm.noteSet)

These questions are all tested in our unit tests explicitly.

Goals

Correctness. Try to be as correct with respect to music theory as possible.
Strong typing. Use types to prevent errors (e.g. Pitch instead of UInt8).
Good performance. Tonic uses bit sets to represent pitch sets and note sets.

The documentation is host on the AudioKit.io Website. The package includes a demo project as well.

Install using Swift Package Manager.