Papers, letters, memoranda, memorabilia, and manuscript music scores assembled by and related to the life and musical activities of Anton Seidl. The collection includes many letters from Cosima Wagner and her children addressed to Anton Seidl and his wife, the opera singer Auguste Kraus Seidl. There are also letters from Lilli Lehman, Edvard Grieg, Antonin Dvorak, Bronislaw Hubermann, Carl Goldmark, Maud Powell, Marianne Brandt, Felix Weingartner, Lyman Abbott, and many others. The letters are chiefly concerned with musical performances, composition, and related affairs. There are journals, diaries, and memoranda in Seidl's hand, as well as photographs and clippings relating to his conducting career. Also, twenty-seven manuscript scores of Seidl's orchestrations of various works.

The Constance Hope papers cover over 40 years of Hope's associations with hundreds of performers and chronicles her career in the field of artists' and commercial publicity.

Letters, notes, programs, photographs, and printed materials. The collection is comprised primarily of handwritten correspondence between Reiner and notable music figures including Samuel Barber, Leonard Bernstein, Aaron Copland, Lukas Foss, Darius Milhaud, Arthur Nikisch. Arnold Schoenberg, Richard Strauss, Igor Stravinsky, and Leo Weiner. Also of note, letters from writer and conductor Gian Francesco Milpiero and his wife Auna detailing wartime conditions in Italy (1946).

Maurice Peress (1930-2017) was an American orchestra conductor, arranger, author, and educator. The papers include audio and video recordings, clippings, contracts, correspondence, diaries, memorabilia, notebooks, photographs, posters, programs, research materials, reviews, scores, scrapbooks, and working files, sketches, and other materials.

Letters of musical composers and performers such as George Gershwin, Douglas Moore, Arnold Schönberg, Arturo Toscanini, Maria Cherubini, Jacques Halévy (F. Halévy), and Gaspare Spontini.

Letters to and from Nicolai Berezowsky documenting his career and covering his development as violinist, conductor, and composer. The profession is well represented in the correspondence, with 63 letters from David Diamond, 22 from Serge Koussevitsky, 72 from Nicolai Lopatnikoff, and 31 from Eugene Ormandy; others in the collection are Leon Barzin, Aaron Copland, Henry Cowell, Vladimir Golschmann, Eugene Goosens, Alex Grechaninov, Ernest Hutcheson, Douglas Moore, Paul Nordoff, Wallingford Riegger, Artur Rodzinski, Roger Sessions, Harold Spivacke, Leopold Stokowski, and Olga Samaroff Stokowski. Organizations, such as the WPA music program, League of Composers, Juilliard School of Music, and the American Society of Composers, Authors, and Publishers, are represented. There are also 15 volumes of music scores.

Letters to Lang from Zoltan Kodaly, Thomas Mann, Ralph Vaughan Williams, and Bruno Walter.

This collection contains the papers of Peter G. Davis (1936-2021), who worked as a classical music critic at various national and specialist publications from 1962-2018. It includes the vast majority of Davis's writings on music (published or draft), along with print material relating to these writings, Davis's compositions (1957-1964), material relating to Davis's early education (1948-1959), and correspondence and interviews with a number of major classical musicians.

Sid Ramin was a composer, conductor, and arranger for Broadway and Hollywood musicals and for television shows, including All My Children, A Funny Thing Happened on the Way to the Forum, Gypsy, and West Side Story.

Tania León. The complete and meticulously conserved and organized archive of the composer, conductor, and educator, dating from her earliest works to the present, ongoing projects. 1960s to the present. Comprising: - Holograph manuscripts, pencil sketches, transparencies, master scores, proofsheets, mimeographs, each carefully identified and filed according to composition and year of date. - An extensive photo archive documenting performances, practices, life. Including the outstanding collection of images made by Marbeth Schnare, who followed Tania León's life and career since 1968 until her death in 2006. These images document the early years as a founding member of the Dance Theatre of Harlem, and constitute a vitally important visual record of this period. - An extensive archive of taped recordings of performances. - An extensive archive of performance programs, articles about Tania León, clipping files, reviews. - An archive of incoming correspondence from colleagues, peers, and admirers. - Awards and commendations. - Posters of performances. - Books with contributions by, or essays about, Tania León.