William Sterling Walker (October 29, 1931 – April 10, 2010) was a baritone with the Metropolitan Opera (1962–1980) whose singing career included performances at the White House, at Carnegie Hall and other concert venues across North America and Europe, and some 60 appearances on The Tonight Show Starring Johnny Carson. From 1991-2002, he produced opera as General Director of Fort Worth Opera in Fort Worth, Texas.
Ashley Putnam (born 10 August 1952) is an American soprano from New York City. Her professional singing career began in 1976 and has spanned over 30 years.
Benita Valente (born October 19, 1934) is an American soprano whose career has encompassed the operatic stage as well as performance of lieder, chamber music and oratorio. She is especially lauded for her interpretations of Mozart and Handel, but she also excelled in certain Verdi roles. The New York Times once referred to her as "as gifted a singer as we have today, worldwide."