Armed with a powerful personality, passionate expressiveness, gift for communication and outstanding technique, internationally acclaimed concert organist Raúl Ramírez will present a free concert at 4 p.m. Sunday, March 15, in Demorest. The Madrid, Spain, native will play on the Sewell Pipe Organ in the Piedmont College Chapel at 992 Central Ave. in Demorest. Ramírez is the first Spanish organist in recent times to establish himself among the elites of the international concert scene.