The impressionism of Debussy is often mentioned in connection with Clarke's work, particularly its lush textures and modernistic harmonies. The Viola Sonata (published in the same year as the Bloch and the Hindemith Viola Sonata) is an example of this, with its pentatonic opening theme, thick harmonies, emotionally intense nature, and dense, rhythmically complex texture. The Sonata remains a part of standard repertoire for the viola. "Morpheus", composed a year earlier, was her first expansive work, after over a decade of songs and miniatures. The "Rhapsody" that Coolidge sponsored is Clarke's most ambitious work: it is roughly 23 minutes long, with complex musical ideas and ambiguous tonalities contributing to the varying moods of the piece. In contrast, "Midsummer Moon", written the following year, is a light miniature, with a flutter-like solo violin line.