GQ is an a cappella and barbershop quartet from Baltimore, MD. Their members are Amanda McNutt, Ali Hauger, Katie Gillis and Katie Macdonald. They sing a variety of styles spanning several decades and are four great friends who have a passion for creating a unique sound. Region 5 Quartets. Spirit of the Midwest Region 5 is proud to have a large number of quartets that perform for occasions large or small. If your next event would be enhanced by some four-part harmony, have a look at our quartets . Midwest Harmony Region 3 of Sweet Adelines International is dedicated to the advancement of four-part harmony, barbershop-style, for women of all ages, through .