Savoy opera
The overture to "The Pirates of Penzance" was composed by Sullivan and his musical assistant Alfred Cellier. It follows the pattern of most Savoy opera overtures: a lively opening (the melody of "With cat-like tread"), a slow middle section ("Ah, leave me not to pine alone"), and a concluding allegro in a compressed sonata form, in which the themes of "How beautifully blue the sky" and "A paradox, a paradox" are combined.