Following graduation, he went to work in the London studio of Gang of Four guitarist/producer Andy Gill, for whom he would program, contribute string arrangements, and play on albums alongside artists such as Michael Hutchence and Bono.

A recommendation from Abbey Road Studios brought him to the attention of Howard Shore, leading to Price's work with the composer as music editor on Peter Jackson The Lord of the Rings film trilogy.

His subsequent films as music editor included Christopher Nolan's Batman Begins, for which he shared with his fellow music editors a Golden Reel Award nomination; and, in his first project with The World's End director Edgar Wright, Scott Pilgrim vs. the World, on which he also collaborated with the film's composer Nigel Godrich.

Among the other composers that he has worked with and learned from are Hans Zimmer, James Newton Howard, Harry and Rupert Gregson-Williams, George Fenton, Dario Marianelli, and Anne Dudley.

He has composed music for advertising campaigns in both the U.K. and U.S. After contributing additional music to Richard Curtis' Pirate Radio, he composed the original score for Joe Cornish's sleeper success Attack the Block, winning awards from both the Austin Film Critics Association and the Sitges - Catalan International Film Festival.