The music of "Crash Bandicoot" was a last-minute aspect added to the game before its showing at the Electronic Entertainment Expo. The producer of Universal Interactive proposed that rather than conventional music, an "urban chaotic symphony" would be created by Andy Gavin causing random sound effects (such as bird vocalizations, vehicle horns, grunts, and flatulence) to be randomly selected and combined. When this proposal was rejected, David Siller introduced the team to the music production company Mutato Muzika and its founder Mark Mothersbaugh. Following this introduction, Mothersbaugh selected Josh Mancell to compose the music for the game based on his previous work on "Johnny Mnemonic: The Interactive Movie". Mothersbaugh advised Mancell throughout the soundtrack's demo stages, after which all composition duties of "Crash Bandicoot" and Naughty Dog's subsequent six titles were delegated to Mancell. Mouse on Mars, A Guy Called Gerald, Aphex Twin and Juan Atkins served as influences on Mancell's "simple but kind of off-kilter" melodies. Dave Baggett served as the soundtrack's producer. The sound effects were created by Mike Gollom, Ron Horwitz and Kevin Spears of Universal Sound Studios. The voices in the game were provided by actor Brendan O'Brien and the game's producer David Siller.