The scale also may be found in music of Alexander Scriabin and Béla Bartók. In Bartók's "Bagatelles", Fourth Quartet, "Cantata Profana", and "Improvisations", the octatonic is used with the diatonic, whole tone, and other "abstract pitch formations" all "entwined… in a very complex mixture" . "Mikrokosmos" Nos. 99, 101, and 109 are octatonic pieces, as is No. 33 of the "44 Duos for Two Violins". "In each piece, changes of motive and phrase correspond to changes from one of the three octatonic scales to another, and one can easily select a single central and referential form of 8-28 in the context of each complete piece." However, even his larger pieces also feature "sections that are intelligible as 'octatonic music'" .