Get the tonic pitch class for a key:

tonic gMinor == PitchClass.g

Get the scale for a key:

scale aFlat == Scale.major PitchClass.aFlat

Check whether a key is major:

isMajor bFlat == True

Check whether a key is minor:

isMinor cSharpMinor == True

Get the key signature for a key as a list of the pitch classes that are sharpened or flattened:

signature bFlat == [ PitchClass.bFlat, PitchClass.eFlat ]

Get the relative minor or relative major of a key:

relative f == dMinor


relative cSharpMinor == e

Get the parallel minor or parallel major of a key:

parallel f == fMinor


parallel cSharpMinor == cSharp

Get the name of a key:

toString eFlat == "E♭"


toString aMinor == "Am"