
Nelson Ackerman Eddy (June 29, 1901 - March 6, 1967) was an American singer and movie star who appeared in 19 musical films during the 1930s and 1940s, as well as in opera and on the concert stage, radio, television, and in nightclubs. A classically trained baritone, he is best remembered for the eight films in which he costarred with soprano Jeanette MacDonald. He was one of the first "crossover" stars, a superstar appealing both to shrieking bobby-soxers as well as opera purists, and in his heyday was the highest paid singer in the world.
During his 40-year career, he earned three stars on the Hollywood Walk of Fame (one each for film, recording, and radio), left his footprints in the wet cement at Grauman's Chinese Theater, earned three Gold records, and was invited to sing at the third inauguration of President Franklin Delano Roosevelt. He also introduced millions of young Americans to classical music and inspired many of them to pursue a musical career.
Description above from the Wikipedia article Nelson Eddy, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Make Mine Music
1946 · as Narrator / Characters (segment "The Whale Who Wanted to Sing at the Met") (voice)

Phantom of the Opera
1943 · as Anatole Garron

That's Entertainment!
1974 · as (archive footage) (uncredited)

Naughty Marietta
1935 · as Captain Richard Warrington

Rosalie
1937 · as Dick Thorpe

That's Entertainment! III
1994 · as (archive footage)

That's Entertainment, Part II
1976 · as (archive footage)

Dancing Lady
1933 · as Nelson Eddy

James Stewart: A Wonderful Life
1987 · as Self (archive footage)

The First 100 Years: A Celebration of American Movies
1995 · as Self (archive footage)

A New Romance of Celluloid: The Miracle of Sound
1940 · as Self

Rose Marie
1936 · as Sgt. Bruce

Hollywood: The Dream Factory
1972 · as Self (archive footage)

Handlebars
1933 · as Singer (singing voice) (uncredited)

Hollywood Singing and Dancing: A Musical History - The 1930s: Dancing Away the Great Depression
2009 · as Self (archive footage)

Bitter Sweet
1940 · as Carl Linden

Hollywood: Style Center of the World
1940 · as Self

Sweethearts
1938 · as Ernest Lane