File consists of various letters to conductors and performers concerning compositions by John Beckwith. Correspondents include: Pierre Hétu, William Aide, Loie Fallis, Barry Shiffman, Louise Laplante, Colin Tilney, Charles Daellenbach, Karen Wilson (CBC), Colin Miles, Barry Cole, Mary Cyr, Aurelie Desmarais, Barbara McLean, Michael Aze, David Jaeger (CBC), Michael Massey, September Payne, Bramwell Tovey, Glenn Buhr, David Lasker, Jukka-Pekka Saraste, Randolph Peters, James Campbell, Mario Bernardi, John Estacio, Lorna J. Murray, Rob McElear, Shelagh Rogers (CBC), Chris Taylor, Christopher Butterfield, Adrianne Pieczonka, Byron Adams, David Fallis, Noel Edison, Wayne Riddell, Michael Koerner, Martine Jost, Wayne Strongman, and Jon Washburn.
File also includes program notes by John Beckwith for various of his compositions; the manuscript for the Coda for "Topical Flutes" (2010); Beckwith's manuscript piano arrangement of the Prelude and Recitative from The Rake's Progress, Act 2, Scene 2 by Igor Stravinsky; a copy of Beckwith's arrangement of "Drimindown" for voice and guitar, arranged for Peter Higham; photographs from the premiere performance of Meanwhile (2018) by the SHHH!! Ensemble (Zac Pulak and Edana Higham); and a copy of "A Little Not-Music", written for Brian Cherney at 75.