Most of the correspondence relates to Carpenter’s musical activities, and includes letters written not only to him but also to his wife, Rue, and his daughter Genevieve (Ginny). There is one folder of drafts or carbons of Carpenter’s outgoing correspondence and one folder of correspondence with his music publisher, G. Schirmer, Inc. Among the well-known correspondents of Carpenter, his wife and daughter are John Barrymore, Sarah Bernhardt, Marcel Duchamp, Percy Grainger, George Herriman, Langston Hughes, Serge Koussevitsky, Fernand Leger, Vachel Lindsay, John McCormack, Pierre Monteux, Gerald Murphy, Sir William Nicholson, Eugene Ormandy, Serge Prokofieff, Artur Rodzinski, Augustus Saint-Gaudens, John Philip Sousa, Adlai Stevenson, Igor Stravinsky, George Szell, Alice B. Toklas, Louis Untermeyer, Bruno Walter and Thornton Wilder.

Also, material regarding Carpenter’s ballet music, including a printed copy of the score of Krazy Kat and sketches of the costumes and staging of Skyscrapers by Robert Edmond Jones; a small collection of autographs including four with cartoons by Clare Briggs, Charlie Chaplin, George Herriman and Charles Schulz; clippings and miscellaneous programs, financial records both personal and professional, a radio interview, and information on his memorial in 1960. There is one folder of material relating to Rue Winterbotham Carpenter, including a lock of her hair. Also, one box of photographs of family and many celebrities, the most interesting of which are shots of Picasso and Stravinsky and one group photo featuring Charlie Chaplin and Douglas Fairbanks. In an oversize box are photos of Arthur Rubinstein and of a vast banquet given for Frederick A. Stock, plus a few designs for Skyscrapers.