Geoff Bartley's rich voice, rollicking acoustic guitar, and soulful harmonica have been delivering a mix of blues, folk, and roots jazz and imaginative original songs to audiences for more than 35 years. He has hosted the Cantab Lounge’s Monday evening open microphone for the past 17 years. Folk writer Scott Alarik refers to Geoff as “a world-class guitarist, a resonantly emotional singer, and a brilliant songwriter with a gift for provocatively personal imagery set to lovely musical landscapes.” The concert begins with an open microphone. Beverages and desserts are $1 each. Net proceeds benefit the Unitarian-Universalist Service Committee. The Coffeehouse off the Square is at the Old Ship Church Parish Hall, 107 Main St., in Hingham Square.