Sor's Sonata in C major, Op. 15b is a single movement in the style of an Italian opera overture, similar to those of Paisiello and Cimarosa. The exact date of composition is unknown, but it is assumed that it is one of his early pieces, written around the time that he was in Barcelona in the late 1790s. During this period his Italianate opera Telemaco nell'isola di Calipso was produced at Barcelona's Teatro de la Santa Cruz. The overall style of the piece is similar to Sor's Sonata, Op. 14 and the opening Allegro of the Grande Sonate, Op. 22. The first part of the sonata is broken into three sections, each with its own theme. All feature short phrases and melodies moving in parallel thirds, with some dialog going on between voices. The first two themes have a repeated-note bass line supporting the melody, while the third section begins with broken chord triplets in the accompaniment line, which in turn lead into a more ornate melody, also in triplets. The second part of the sonata begins a new theme over an Alberti bass-like figure, and then moves back to a recapitulation of the sonata's opening two themes and a short reference to the third before going into the coda. The rhythmic motifs that are used to transition between themes are typical of Italian operas of the late eighteenth century. Sor uses these as puctuation marks to indicate the ends of themes, rather than more sophisticated development of thematic material. The work is not especially witty, refined, or complex, but it is quite lively and good-natured.

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