The Logarhythms amuse hundreds at the Greater Boston Invitational Songfest in Kresge last Saturday. GBIS is an annual concert held during Parent’s Weekend that showcases all of MIT’s a cappella groups. Diana Ye—The Tech May. 9, 2016 Facebook Twitter Reddit Print The Logarhythms amuse hundreds at the Greater Boston Invitational Songfest in Kresge last Saturday. GBIS is an annual concert held during Parent’s Weekend that showcases all of MIT’s a cappella groups. Diana Ye—The Tech