Grey Matter, born Andrew Gutterson, is an underground New York beatboxing savant. He’s a skilled teacher, as evidenced by his beatboxing tutorial series, which has been viewed over 5,000,000 times, and has the charisma to connect with huge names in the music industry. He’s worked with Justin Bieber on MTV and Cee Lo Green for a 7 Up commercial, and had work featured on Showtime and BET. He’s performed for NYC Mayor Michael Bloomberg and Jaleel White (best known for playing the infamous Steve Urkel), and frequents Long Island’s 5 Pointz, the Mecca of graffiti where music legends such as Doug E. Fresh, Kurtis Blow, Rahzel, and Joan Jett stop by. We spoke with Grey Matter, who described himself as “a regular, chill guy who makes noise with his mouth,” for this week’s Five Questions.