Czerny: 100 Progressive Studies without Octaves, Opus 139By Carl Czerny ed. Maurice Hinson Op. 139 begins with an easy level of pieces and gradually increases to a moderately difficult level. Some of the technical devices in these pieces include: right hand melody with left hand accompaniment; diatonic and chromatic scalar and arpeggio figurations; syncopated melodies and trills. Many of the studies can be transposed into other keys and practiced at varied tempos.