Violinist Nathan Bishop, shown here, will be joined by accordion player Rob Curto for a free concert in Hopewell on September 20 at 4 p.m. at Hopewell Old School Baptist Meetinghouse, 46 West Broad Street. The focus is the American fiddling tradition. Bishop will play three instruments: Irish fiddle, Scandinavian Hardanger d’amore fiddle, and classical baroque violin. Visit oldschoolbaptistmeetinghouse.com for more information.