[4] The score album, featuring an original song "We Belong Together" performed by Newman, and instrumental tracks were released on June 15, 2010 by Walt Disney Records.

It was also the sixth Pixar film not to be scored by Michael Giacchino or Thomas Newman.

But Pixar decided against doing so, and instead wanted him to sing the track as "to retain that consistency" as he voiced for the songs in the first two instalments.

[11][12] In a 2015 interview, Newman recalled that he was unhappy with the director Lee Unkrich, on using the temporary version of the score.

[19] The Judas Priest song "Electric Eye" was also used in the film in the temp score for the opening scene of Toy Story 3.