Also in 1936 he made his first appearance at the Worcester Festival in a concert of opera arias with soprano Helen Jepson and conductor Albert Stoessel.
In 1941 Britton made his Carnegie Hall debut portraying the title role in Giacomo Puccini's Gianni Schicchi with the National Orchestral Association under the baton of Léon Barzin.
In 1945 he presented the world premiere of Miriam Gideon's art song "The Hound of Heaven" at the International Society for Contemporary Music convention.
[13] The following year he returned to the Paper Mill Playhouse (PMP) to star in a production of Sigmund Romberg's The Student Prince.
In 1946 he portrayed Huckleberry Haines in Jerome Kern's Roberta at the Los Angeles Civic Light Opera and starred in Victor Herbert's The Fortune Teller at the Curran Theatre in San Francisco.
[15] He made his Broadway debut at the New Century Theatre in September 1946 as Sandor in Robert Wright and George Forrest's Gypsy Lady.
In 1950 he portrayed Don Andrès de Ribeira in Jacques Offenbach's La Périchole at New York's Town Hall under the direction of Maggie Teyte.
He made several appearances with Philadelphia's Co-Opera Company in the early 1950s, including Mr Gobineau in Gian Carlo Menotti's The Medium.
In 1961 he appeared in the United States premiere of Roland Fiore's Linda at the Philadelphia Lyric Opera Company.