Pete Coolidge and Ross Swain, above, will perform in separate sets beginning at 6 p.m. Friday, July 15, in the town common. Performances are part of the Andover Summer Concert Series. Swain will perform piano solos, including Scott Joplin ragtime, a waltz, and a 1930s Fats Waller stride piano piece. Coolidge will finish the evening with his signature guitar playing and vocals. Many of Coolidge’s selections are originals focusing on life around the town. Event is free and weather permitting. FMI: 207-392-2572.