"The Apprentice" has included various pieces of classical and popular music throughout. Numerous pieces from film soundtracks are used as well as music featured in the BBC TV series Doctor Who. Examples of the music used include the opening theme ("Dance of the Knights" from "Romeo and Juliet" by Prokofiev) and "The Boardroom", "You're Fired" and "Closing Credits" from "The Apprentice (Original Theme)" by Dru Masters. An official soundtrack was released on 4 June 2007. At the beginning of the first episode of Series 6, the iconic string phrase from the first movement of Gustav Mahler's Sixth Symphony can be heard in, one might surmise, a numerological nod. Further episodes in Series 6, include an extract from a piece by the French composer and pianist, Erik Satie, (from his "Gymnopédies No 1"), music from the Disney-Pixar 2009 film, Up, composed by Michael Giacchino, and a famous extract from Benjamin Britten's opera, Peter Grimes. A number of episodes also featured brief snippets of several tracks from The Sims series of games, such as the neighbourhood theme from The Sims 3, was briefly used in the last episode of series 6 and one of the build tracks from Makin' Magic was used in Series 7 episode 8.