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[Creeperopolis]

The Sonata for E♭ Alto Saxophone and Piano, Op. 19, was composed by Paul Creston in 1939. The sonata was commissioned in the spring by Creston's frequent collaborator, the American saxophonist Cecil Leeson. Creston began composition by June: it was completed by the end of August and slated for publication in 1940, although this was postponed to 1945 due to World War II.

The sonata is in three movements and takes around thirteen minutes to perform. Its form follows a traditional, classical-era structure. The first movement is in a modified sonata form with no recapitulation: two themes are introduced in an exposition and extensively developed, before the movement ends with a coda. Harmonically, it is based on seventh chords, with its tonality moving between several tonal centers. A slower middle movement with song-like melodies follows, before the sonata ends with a rhythmically complex rondo featuring polymeters. The sonata as a whole is of considerable difficulty for both players.

Creston and Leeson premiered the sonata at the Carnegie Chamber Hall on February 15, 1940, although Leeson had performed it on tour prior to that date. No critics were present at the premiere, but the sonata's 1955 debut recording by Vincent Abato and Creston obtained a mixed response. Most found the sonata enjoyable, but there was criticism of a perceived simplistic and salon-like styling. It was the first of Creston's chamber works to be recorded and had appeared on fourteen records by 1980. Today, it is broadly seen as a key piece of the classical saxophone's repertoire and is frequently performed.