The Clarinet sonata was composed from August 25 to September 5, 2005 and comprises two movements. The first one is a fantasy built on a melodic motif with a descending minor second and an ascending major second that is presented as a sort of ostinato in many different rhythmic variants. It is disturbed by frequent digressive episodes that arise from the elaboration of a diminished fifth interval. The second movement has a sonata-form structure whose first theme is meant, both during the exposition and the development, to create a polyphonic illusion. To this aim there is a systematic use of zigzag melodies as well as a resort to timbrical contrasts between the different registers of the instrument. The development presents two sections, each one preceded by an episode in which the virtual polyphony becomes contrapuntal as the ostinato motif of the first movement is revisited and opposed to two ideas, one of them taken from the second theme. The reexposition is brief and comprises a variation of each main theme. The coda exhibits a fading but not relaxed character until the last measure, where a final energy blast growls in the bass.