The collection contains 423 indexed images and approximately 350 additional, un-indexed snapshots. The images include publicity shots, professional photographs and snapshots of Mikhashoff in rehearsal and performance, and snapshots from some of Mikhashoff's travels. Other people included in the images include noteworthy performers and composers, such as Aaron Copland, Virgil Thomson, Sylvano Bussotti, Henri Dutilleux, Giacinto Scelsi, Toru Takemitsu, Frederic Rzewski, Luis de Pablo, Henry Brant, John Cage, Milton Babbitt, Conlon Nancarrow, Nils Vigeland, and Poul Ruders.

The images in the collection provide documentation of performances at the University at Buffalo by Music Dept. faculty and visiting artists, especially in the realm of contemporary music. Among the many notable composers represented in the collection are: Earle Brown, Harrison Birtwistle, Pauline Oliveros, Colin Bright, Julius Eastman, John Cage, Morton Feldman, Lejaren Hiller, Cornelius Cardew, Carlos Chavez, Aaron Copland, Lukas Foss, Elliott Carter, David Del Tredici, Harold Shapero, Ralph Shapey, Ingolf Dahl, Henri Pousseur, Philip Glass, George Crumb, Fredric Myrow, Leon Kirchner, George Rochberg, New Rorem, Allen Sapp, Toru Takemitsu, Morton Subotnick, Leo Smit, and Augusta Read Thomas.

The collection contains 192 photographs from the personal collection of composer, arranger, and pianist, Livingston Gearhart. They include photographs of Nadia Boulanger and her summer class of 1938 at the Conservatoire Américain de Fontainebleau, Gearhart and his first wife and duo-piano partner, Virginia Morley, Darius Milhaud and his family, and the Budapest String Quartet. The collection also includes four photographs of composer Johannes Brahms in 1896.

Chiefly photographs of opera singers and productions, with additional photographs of other musicians, ensembles, and performing venues. Many of the photographs bear inscriptions to Dr. Perry.

The Irene Haupt Photographs of Musicians in Buffalo contains images of composers and performers who have participated in new music events at the University at Buffalo ca. 1978-1999. Composers represented in the collection include Larry Austin, Milton Babbitt, Henry Brant, John Cage, Elliott Carter, Aaron Copland, Jacob Druckman, David Felder, Morton Feldman, Lejaren Hiller, Lukas Foss, Ernst Krenek, Otto Luening, Conlon Nancarrow, Pauline Oliveros, Bernard Rands, Steve Reich, Poul Ruders, Frederic Rzewski, Ralph Shapey, Leo Smit, Virgil Thomason, Nils Vigeland, and Charles Wuorinen. Notable performers include Ursula Oppens, Yvar Mikhashoff, Frances-Marie Uitti, Jan Williams, Diamanda Galas, Miles Anderson, Leroy Jenkins, Malcolm Goldstein, and Carol Plantamura.

Contains 250 digital images of musicians who participated in the June in Buffalo 2018 at the University at Buffalo, including guest composers John Harbison, Roger Reynolds, Hilda Paredes, Hans Thomalla, and Louis Karchin.

Contains 314 digital images of musicians who participated in the June in Buffalo 2016 at the University at Buffalo, including guest composers Hans Abrahamsen, Hanna Eimermacher, Joshua Fineberg, Josh Levine, and Chinary Ung.

Contains 375 digital images of musicians who participated in the June in Buffalo 2015 at the University at Buffalo and the associated June in Buffalo Performance Institute, including guest composers Roger Reynolds, Martin Bresnick, Brian Ferneyhough, August Read Thomas, Harvey Sollberger, Charles Wuorinen, and Steven Stucky.

Contains 180 digital images of musicians who participated in the June in Buffalo 2014 at the University at Buffalo, including guest composers Joshua Fineberg, Stephen Hartke, Philippe Hurel, Hilda Paredes, and Bernard Rands.

Contains 203 digital images of musicians who participated in the inaugural June in Buffalo Performance Institute and the June in Buffalo Festival 2013 at the University at Buffalo, including guest composers Raphaël Cendo, Brian Ferneyhough, Augusta Read Thomas, Charles Wuorinen, and Yehudi Wyner.