The soundtrack album was issued in 1956 to coincide with the TV premiere of the movie due on November 3. Until then, the songs were available for purchase in a different recording, made in July 1939 for the
Decca label.
The Decca album (catalog number 74) featured vocals only by
Judy Garland and the
Ken Darby Singers, none of the other movie cast members participated. According to
Billboard, editing a soundtrack album was a complex challenge before the advent of stereophonic sound, as dialogue, music, and sound effects were all recorded on the same track. In the case of
The Wizard of Oz, planned as the first release by MGM Records, the integration of dialogue and music made it impossible to extract three-minute versions of the songs, except for "
Over the Rainbow". The project was abandoned until the introduction of LP records. According to the magazine, by 1967 the film's original soundtrack, which includes both music and dialogue, remains one of MGM's best-selling releases. ==Critical reception==