However, there are a number of exceptions to this rule, such as "The Piña Colada Song" by Rupert Holmes, where the re-recording lacked the desired energy and spontaneity, or "Superstar" by the Carpenters, where the scratch was so well performed that a re-record was deemed unnecessary.
[1] Scratch vocals are also often used in the production of feature-length animated films to bring storyboards to life as "animatics," in which storyboard frames are synced to the relevant dialogue, together with a rough soundtrack generated on a synthesizer.
Animation directors "hire temporary voices to help find their way through various script revisions, visual renderings and other steps of the process.
"[2] Scratch vocals may be obtained from professional voice actors (who may or may not be well-established in the voice-over community but are generally unknown to the general public) or from anyone around the studio willing to chip in a line or two (as well as friends or family members).
However, in the rush to meet deadlines, if the scratch vocals for a minor role are good enough, the director may skip auditions and simply use the actor who recorded the scratch vocals in the role.