Mixing rap, rock, R&B, funk, pop and just about anything else, Gym Class Heroes have a sound that is based in hip-hop but explodes with live instrumentation and a zeal for anything that tickles their fancy. The Geneva, N.Y., group’s origins lie in, go figure, high school gym class, where frontman Travis McCoy met drummer Matt McGinley. The addition of guitarist Disashi Lumumba-Kasongo and bassist Eric Roberts completed the group, which has developed its sound through incessant touring. With the summer’s Warped Tour behind them and their second full-length, “As Cruel As School Children,” burning up hipster headphones, Travis parked his butt in the mtvU Hot Seat to answer our burning questions.