like Wicked receives no radio airplay. New boutique labels such as PS Classics and Ghostlight release many of the cast albums of recent Broadway hits. With the recent merger of Sony Music (formerly Columbia Records) and BMG Music (formerly RCA Victor), many older editions of cast recordings are being deleted and newly remastered editions are being released. Technical limitations A 10-inch 78-rpm disc could hold about minutes of music per side. A 12-inch 78-rpm could last minutes. Early albums had to severely abridge selections to fit the format. With LP cast recordings, usually released as single discs, it was not rare for compromises to be made to fit the recording within the forty-to-fifty-minute time limit. For example, reprises, or minor songs might not be included. By the 1980s, the rise of the compact disc with its 74-minute recording capacity (which was increased to 80 minutes in the 1990s) resulted in improvements in cast recordings, which were now usually capable of including all songs, the full overture and entr'acte, and, when appropriate, lead-in dialogue to the songs. In recent years, some cast recordings have been recorded live, in recording studios incorporated into the theater concerned. Otherwise, live recordings tend to trade sound quality for freshness and immediacy. Alternate versions It is often the case that many cast recordings may be made for the same show. 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. For some musicals created before cast recordings became the norm, studio cast recordings are all that exist to document the original productions' orchestrations. Such studio cast recordings have been made of many early musical comedies by the Gershwins (George Gershwin and Ira Gershwin), Vincent Youmans, and Rodgers and Hart. Terms Original cast: the premiere or original cast of the production (original Broadway cast; original London cast; original Toronto cast; original Australian cast, etc.). This can (rather confusingly) include revivals as well as first productions. Less misleading in this last case is "Revival Cast". Studio cast: assembled by a record company. In the early days, the studio cast singers were often