PentaBlue — a tritone or blues tonality and basic pentatonality
Tonalibus 2f-8 penta – 2021-04 – 40
Tonalibus 2f-8 penta – 2021-04 – 41
Tonalibus 2f-8 penta – 2021-04 – 42
Scale and sound samples
- Tritone or blues tonality matrix: The octave includes the tritone plus for a heptatonality one, for a hexatonality two, and for a pentatonality three Reach steps (augmented seconds). These take off from the fundamental or from the quint. They are not framed by half steps (or semitones), of which there are three for hepta-, two for hexa-, and one for pentatonalities. When more than one of them, then some are consecutive.
- Pentatonality matrix: The octave of a regular pentatonality includes two Reach steps, three whole steps, and no half step (or semitone). One or two consecutive whole steps frame and separate the two Reach steps. A clustered pentatonality has two consecutive Reach steps and three consecutive whole steps. Some further basic pentatonalities contain three Reach steps, at least two of them consecutive. And extended pentatonalities include a double whole step plus one or two Reach steps.
- PentaBlue: The name indicates that this a pentatonic version of a tritone or blues tonality.
- Step pattern: Ascending from the fundamental (tonic or Do), two consecutive Reach steps lead to a half step. Then comes another Reach step. Finally a whole step leads up to the octave.
- Scale intervals: Minor third, tritone, quint, and minor seventh.
- Tetra- and trichords: The lower tetra- or trichord is PentaBlue and the upper is PentaMin.
- Harmonic axes: There is one axis, which is vertical, N-S.
- Primary harmonic anchors: The fundamental or North anchor and the East anchor are only partially present, with their head and right leg only. Also the contrast or South anchor is partial, with only its head. The West anchor is completely absent.
- Secondary harmonic anchors: There are no secondary anchors.
- Three blue Reach steps and a half step: The presence of these steps results in a very distinct blues flavor. A half step is a strong contrast in a pentatonality.
- Penta- to hepta- and hexatonality correlation: PentaBlue is equivalent to ReachUpMin without its major second and minor sixth, to ReachUpMix without its major second and major sixth, or to HexaBlue without its quart.