From Chorus America: “The Chorus Impact Study: Singing for a Lifetime was conducted by leading research firm Grunwald Associates, the organization that previously conducted the 2009 study. Researchers did online surveys with more than 5,700 choral singers, including more than 1,800 singers ages 62 and older. They additionally surveyed 500 members of the general public and 600 members of the general public ages 62 and older for comparison.