never aware of their own absurdity but were coherent internal wholes. Sullivan conducted the music rehearsals. Sullivan had sketched out the music for Pirates in England. When he arrived in New York, however, he found that he had left the sketches for Act I behind, and he had to reconstruct the first act from memory, or compose new numbers. Gilbert told a correspondent many years later that Sullivan was unable to recall his setting of the entrance of the women's chorus, so they substituted the chorus "Climbing over rocky mountain" from their earlier opera, Thespis. Sullivan's manuscript for Pirates contains pages removed from a Thespis score, with the vocal parts of this chorus altered from their original arrangement as a four-part chorus. Some scholars (e.g. Tillett and Spencer, 2000) have suggested that Gilbert and Sullivan had planned all along to re-use "Climbing over rocky mountain," and perhaps other parts of Thespis. They argue that Sullivan's having brought the unpublished Thespis score to New York, when there were no plans to revive Thespis, might not have been accidental. In any case, on 10 December 1879, Sullivan wrote a letter to his mother about the new opera, upon which he was hard at work in New York. "I think it will be a great success, for it is exquisitely funny, and the music is strikingly tuneful and catching." As was his usual practice in his operas, Sullivan left the overture for the last moment, often sketching it out and entrusting completion of "the details" to an assistant, in this case the company's music director, Alfred Cellier. Pinafore opened in New York on 1 December 1879 and ran for the rest of December. After a reasonably strong first week, audiences quickly fell off, since most New Yorkers had already seen local productions of Pinafore. In the meantime, Gilbert and Sullivan raced to complete and rehearse The Pirates of Penzance. The work's title is a multi-layered joke. On the one hand, Penzance was a docile seaside resort in 1879, and not the place where one would expect to encounter pirates. On the other hand, the title was also a jab at the theatrical "pirates" who had staged unlicensed productions of H.M.S. Pinafore in America. To secure the British copyright, a D'Oyly Carte touring company gave a perfunctory copyright performance of Pirates the afternoon before the New York premiere, at the Royal Bijou Theatre in