The tritone scale, C D(flat) E G(flat) G(natural) B(flat) is enharmonically equivalent to
the Petrushka chord, C C(sharp) E F(sharp) G A(sharp).
The two-semitone tritone scale, C D(flat) D F(sharp) G A(flat), is a symmetric scale
consisting of a repeated pattern of two semitones followed by a major third now used
for improvisation and may substitute for any mode of the jazz minor scale. The scale
originated in Nicolas Slonimsky's book Thesaurus of Scales and Melodic Patterns
through the, "equal division of one octave into two parts," creating a tritone, and the,
"interpolation of two notes," adding two consequent semitones after the two resulting
notes.
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