Ms. Richardson, who appeared as an extra in more than 100 Hollywood films as a child, spent years as Sister Agnes Marie before coming to New York and eventually becoming editor of Seventeen magazine.
Ms. Davy, a Brooklyn-born soprano, was known as an interpreter of 20th-century music, including the work of Richard Strauss, Benjamin Britten and Paul Hindemith.
Mr. Carroll performed with the 1950s doo-wop group the Cadillacs, and later found contentment, plus a measure of abiding renown, as a New York City school custodian.