LEWISTON — At 7:30 p.m. Saturday, Nov. 2, the Maine Music Society will present the 20th annual Battle of the Blends XX at the Franco Center. The show’s lineup includes a powerhouse of a cappella singing, with Maine-ly Harmony, Talk to the Hand, Mt. Blue Voices, None of the Above, Renaissance Voices and The Deansmen all making appearances. For more information, visit www.mainemusicsociety.org.