We are Backtrack, a new a cappella group from New York City! This is our third single, Troublemaker, by Olly Murs! Special thanks to Grey Matter for his beat boxing on this track! Backtrack is: Soprano: Kara Lewis Alto: Carly Cantor Baritone: Brett Parker Bass: Andrew John Kim Beatboxing: Grey Matter Additional Info: Producer & Recording Engineer: Andrew John Kim Mastering Engineer: Gabriel Gutiérrez at Zampol Productions Mastering Studios