More than 50 U.S. cities will be hosting Make Music Day, a free one-day outdoor festival celebrating music and music-making. The annual event is June 21, the summer solstice. Highlights of Make Music Day in the U.S. will include Sousapaloozas in Chicago; Cleveland; Madison, Wisconsin; Minneapolis-St. Paul; New York; and San Jose, California. Part of Make Music Day is an event called Mass Appeal in which musicians play together in single-instruments groups. Featured instruments will include guitars, harmonicas, accordions, trombones, bassoons, French horns and harps. More than 150 are scheduled. Street Studios in Atlanta; Chattanooga, Tennessee; Minneapolis-St. Paul; New York; and Philadelphia will give passers-by a chance to collaborate in producing original music. The festival began in France in 1982 and has since spread to 750 cities across 120 countries.