Original sentence: For some musicals created before cast recordings became the norm, studio cast recordings are all that exist to document the original productions' orchestrations.In addition to the recording of the cast of the original production, later high-profile productions may also produce cast recordings: for example, a recording by the cast of the first London production of a show that originated on Broadway, or of the first Broadway cast of a show that originated off-Broadway, or of the cast of a revival produced many decades later than the original production.It is often the case that many cast recordings may be made for the same show.Such studio cast recordings have been made of many early musical comedies by the Gershwins, Vincent Youmans and Rodgers and Hart
Edited sentence: For some musicals created before cast recordings became the norm, studio cast recordings are all we have.Studio cast recordings that attempt to document the original orchestrations have been made of many early musical comedies by the Gershwins, Vincent Youmans and Rodgers and Hart.Though the alternates may offer a more complete reading and often better sound, only the premiere casts who had weeks of rehearsals and try-outs to shape the performances under the watchful eyes of the authors can provide the authentic document.With rare exceptions, one should always look to the original Broadway cast recording over later revival and studio cast recordings