The collection consists of holographs and/or ozalid copies of musical sketches for TV commercials, radio programs; television shows, and various television specials, and holographs or copies of motion picture scores. Also included are additional manuscript scores, framed tributes, awards, letters of recognition, photographs with personalities, drawings, and sound recordings.

Alexander was a founder of the Screen Composers of America; he wrote music for more than 40 feature films, starting with Shall We Dance (1937), and including The Mating Game, The Tender Trap, and Jailhouse Rock; collaborated on several MGM musicals, including Gigi, Singin' In The Rain, and Kismet; arranged music for various radio programs, including The Hit Parade, The Camel Hour, and The Lucky Strike hour; he was music director for Amos 'n' Andy and Hollywood star playhouse; composed music for television shows, including Columbo, Wagon Train, and The Twilight Zone; died at the age of 79 on Whidbey Island, Washington, on Dec. 23, 1989.