Represents one non-octval tone in a chord. Chord
tones are not ordered and arrays of chord tones should be compared using
to_set.
Attributes
- tone - A tone index from 0-11 representing the relative position
of the tone within the chromatic scale.
- letter_index - A 0-6 value representing the relative letter
position, which helps to disambiguate theoretic values such as Eb and D#.
See Key.
- strength - A strength metric representing the tonal strength of
the tone within the context of the chord. Lower numbers are stronger. Zero
always represents the root of the chord and any guide tones should be
defined as one.
- omitable - Specifies whether the tone can commonly be ommitted in
jazz voicings for this chord. For example, the root and the fifth are often
not necessary.
Key Context
+key+ is delgated to chord to access the chord's key context.