Singing in choirs is the most popular performing arts activity in the U.S., according to a new study, with better than 28 million Americans (about 10% of the total population) singing in some sort of organized chorus. “The study found a link between early exposure to choral singing and adult participation in choruses. More than half of adult singers had grown up in a household that included a chorus member, and nearly 70 percent had first sung in elementary or middle school.”