There are some adventurous sounds and techniques, although used sparingly: modality, black-key forearm clusters, whole-tone scales
and one brief instance of polytonality.
77-80), which uses devices such as whole-tone scales
, and the seventh movement of the Etudes tableaux op.
The other quotient groups are [C.sub.12]/[C.sub.2], representing the six tritones; [C.sub.12]/[C.sub.3], representing the four augmented triads; and [C.sub.12]/[C.sub.6] representing the two whole-tone scales
. The fact that the quotient group [C.sub.N]/[C.sub.K] has N/K elements makes it easy to figure out how many chords or scales of a given type exist.
Patterns include scales with arpeggios; scales in tetrachords, modes and thirds; arpeggiated diatonic chords and chromatics; blues; pentatonic and whole-tone scales
. The second half presents all scales exercises by key.
The rhythmic vitality is maintained in the next section, "poco meno mosso," but the language is now that of whole-tone scales
and augmented triads.