Heather Pierson, whose audio defies categorization, performs with her trio in Rockport on Saturday, Jan. 7, at 7:30 p.m. at Fellowship Hall of the Very first Congregational Church of Rockport. Primarily based in New Hampshire’s Mount Washington Valley, Pierson is a pianist, singer-songwriter and nationally touring performer whose tunes delves into Americana, blues, New Orleans jazz, vocal chants and folk. She is extensively acknowledged for her simplicity at the piano and her bell-tone vocals. Her visual appeal in Rockport comes on the heels of the trio’s December tour OF additional than 15 venues in New England. Pierson is keen to share some her songs and some classics with Rockport audio…