This collection contains significant correspondence mainly from the 1950s and 1960s with Cleveland Orchestra conductor George Szell, conductor and Chicago Symphony Orchestra music director Artur Rodzinski, composer and pianist Alexander Tcherepnin, and journalist and NBC anchor John Chancellor.

Additionally, the collection includes large scrapbook pages containing newspaper clippings of Marsh’s reviews and columns, some correspondence, other clippings collected for personal interest, and memorabilia collected from 1969-1978.

Also included are Marsh’s classical record reviews from High Fidelity Magazine and his corrected unbound copy of The Cleveland Orchestra.

A 2015 addition from the Estate of Kathleen Marsh includes reel-to-reel tape recordings (currently inaccessible) of radio broadcast interviews and features on classical music, photographs of prominent conductors and musicians, many autographed to Marsh, and some memorabilia. The Peabody award certificate along with the recording of the Stravinsky program were also donated.