Scope and arrangement
The collection consists of five series. The first series, Business records contains 9 subseries: Recording sessions, Legal services of Linden and Deutsch, Advertising agencies, Broadcasting identification packages, Publicity, Siday's writings, Studio equipment, Inventions, and Other. The second series, Personal papers, contains four subseries: Certificates, Travel, Autobiographical essays, and Edith's condolences. The third series, Music Scores, contains seven subseries: Compositions and arrangements, Station identification, Compositions, Stations, Modern Plan, Product advertisements, and Ozalids. The fourth series contains photographs and negatives, including of Siday's wife, Edith Siday, who was a professional dancer. The fifth series contains oversized photographs, musical scores, business records, and one certificate. Companies for which Siday wrote musical material include: Wesson Oil, Birds Eye, Westinghouse, Folger's Coffee, Kool, Jello, Rinso, Sprite, Coca-Cola, Pall Mall, Old Spice, Maxwell House, Bufferin, Campbell's Soup, Dodge, Hills Brothers, Gulf, Schlitz, Newport Bridge, and Wrigley's Gum.
Arrangement
Original folder titles were maintained and folders were arranged alphabetically. The series reflect Siday's original organizational scheme.