One of the charter members of ASCAP,[1] Webb has hundreds of film music credits to his name, mainly with RKO Pictures.
Webb is credited as composer or arranger on more than 200 films, and received Academy Award nominations for Quality Street (1937), My Favorite Wife (1940), I Married a Witch (1942), Joan of Paris (1942), The Fallen Sparrow (1943), The Fighting Seabees (1944), and The Enchanted Cottage (1945).
His piano concerto from The Enchanted Cottage was performed by the Los Angeles Philharmonic Orchestra, conducted by Constantin Bakaleinikoff, in concert at the Hollywood Bowl in 1945.
Several cues composed by Webb replaced those by Bernard Herrmann in The Magnificent Ambersons after the film was re-edited.
The Christopher Palmer Collection of Roy Webb Scores is held at Syracuse University, New York.