While Buddy Ebsen had been taken off the project from his allergic reaction to the Tin Man's makeup, his vocals remain whenever the song "We're off to see the Wizard" is played. Jack Haley's vocals were never used during the song, but were used for "If I only had a Heart" and "If I only had the Nerve." Ebsen's vocals can also be heard in the soundtrack for the extended version of "If I were King of the Forest," though the spoken segment has Jack Haley.