The collection contains music manuscripts, business papers, and scrapbooks. The music materials include holograph manuscript scores and sketches, inked score paste-ups for publication, pencil scores and sketches, drafts, annotated photo-reproductions, and several score transparencies. The business papers chiefly consist of letters and telegrams; contracts; programs; correspondence from universities and publishers, particularly C.F. Peters; student inquiries; letters from various colleagues and friends, such as David Burge; and other documents. The scrapbooks comprise seven custom bound volumes of clippings, programs, photographs, interviews, posters, and other materials that detail Crumb's musical accomplishments. In addition, they include hundreds of performance reviews from both American and international newspapers.