 The theme and incidental music were composed by David Arnold and Michael Price . Arnold explains that he and Price worked with the producers to " come up with a central theme and character " for the series , then found what was " going to be the defining sound of this show " . Pieces were often constructed using synthesizers , but the tracks used for the show were recorded using real musicians , Arnold says , to bring the music " to life " . Similarly , Price comments that the musicians can adapt their performance of a score by responding to footage from the show . 
