The all-female, a cappella chorus Maine-ly Harmony and guest quartets Back Bay Four and Out on a Whim will take the stage on Friday, Aug. 20, at the Araxine Wilkins Sawyer Foundation in Greene. Maine-ly Harmony, directed by Kathy Greason of Hallowell, has been performing a cappella barbershop harmony for 20 years. Showtimes are 2 and 7 p.m. Back Bay Four will perform at both shows. Out on a Whim will perform at the 7 p.m. show. Admission is free. Sawyer Memorial is at 371 Sawyer Road.