[1] He initially worked primarily on the West Coast in Seattle as a conductor of theater orchestras and as an organist accompanying silent films.

This parody of a Horst Wessel song was, mainly through the version by Spike Jones and His City Slickers, one of the biggest hits during the Second World War.

Other shorts he scored included Ben and Me (1953), about Benjamin Franklin and a mouse, and the Oscar-winning Toot, Whistle, Plunk and Boom (1953), the first cartoon to use the new CinemaScope process.

[3] He went on to score Victory Through Air Power (1943), The Adventures of Ichabod and Mr. Toad (1949), Cinderella (1950) along with Paul J. Smith, Alice in Wonderland (1951), Peter Pan (1953), and White Wilderness (1958).

Starting with Seal Island (1948), Wallace also specialized in musical accompaniments for Disney documentaries, including nearly all the films for the "People and Places" series and some of the True-Life Adventures.

[4] He remained active in the studio in Los Angeles until shortly before his death at a Burbank, California hospital on September 15, 1963, at the age of 76.