sentences:  The role of Glinda was sung by an unnamed soprano with an operatic voice, the solo part in "If I Only Had a Brain" was performed by composer Harold Arlen, and in the song "If I Only Had A Heart", the role of the Tin Man was sung by a tenor whose voice bordered on falsetto.The two songs Garland sang on the album, "Over the Rainbow" and "The Jitterbug," had already been released as a 78-rpm single in 1939 only a month after the film's premiere, on a single that had nothing to do with the Brunswick Records recording released by MGM, and were incorporated into the 1940 album.On the rest of the 1940 album, an unnamed soloist took the role of Dorothy.