The Norwalk Youth Symphony invites interested students and parents to its open house Sunday, April 27, from 1:30 to 3:30, at Norwalk Concert Hall, 125 East Avenue, Norwalk. Conductors, student musicians and board members will give guided tours and answer questions. The youth symphony is comprised of students from 30 towns. The organization sponsors six tiered orchestras with students from the fourth through 12th grades. The new junior strings orchestra accepts younger musicians. Information: 203-866-4100 or visit norwalkyouthsymphony.org.