he witty and rollicking tale of a young man apprenticed to a band of pirates too kindhearted for their own good, The Pirates of Penzance, or The Slave of Duty remains one of Gilbert and SullivanÂ's most beloved and frequently revived works. This newly engraved performing edition is based on SullivanÂ's autograph, contemporary copyistsÂ' scores, and both the first and second editions of the vocal score. It corrects numerous errors that have crept in over the years and is the first edition to offer performers the choice of using either the 1880 or 1908 versions of the Act II finale. Aficionados will be particularly delighted with the first accurate full score of the Â"Climbing over Rocky MountainÂ" section, which incorporates music from the legendary lost Gilbert and Sullivan operetta Thespis. Introduction by the editors. Instrumentation.