MIT a cappella group Resonance performs “Headlock” by Imogen Heap at the Habitat for Humanity Benefit Concert last Friday in 10-250. Chelsea Grimm—The Tech May. 9, 2016 Facebook Twitter Reddit Print MIT a cappella group Resonance performs “Headlock” by Imogen Heap at the Habitat for Humanity Benefit Concert last Friday in 10-250. Chelsea Grimm—The Tech