Music21j Class: Key

Class: Key

.key. Key

Create a Key object. Like a KeySignature but with ideas about Tonic, Dominant, etc.

TODO: allow keyName to be a music21.pitch.Pitch
TODO: Scale mixin.

Name	Type	Argument	Description
`keyName`	string		a pitch name representing the key (w/ "-" for flat)
`mode`	string	<optional>	if not given then the CASE of the keyName will be used ("C" => "major", "c" => "minor")

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