Correspondence including with Benjamin Britten, Peter Pears, EM Forster, Poulenc, Kodaly, Copland, Gordon Crosse, Boris Blacher, Ralph Hawkes, Anthony Gishford, Eric Crozier, Edward Dent and Otto Reik.
Music manuscripts for 'Tell me where is fancy bred' by Poulenc and Kodaly.
Press cuttings, including relating to 'Classical Songs for Children' edited by the Countess of Harewood and Ronald Duncan.
Photographs including of Marion with Britten, Pears and other friends and colleagues.
Papers including Erwin Stein's notes and articles.
Marion's articles, programme notes, biographies, broadcasts, reviews, speeches and lectures.
Printed materials relating to Britten, some inscribed by the author.
Files concerning Britten and the Russian connection.
Erwin Stein's printed scores for Britten and non-Britten works, some with annotations.
Marion's printed scores for Britten and non-Britten works, some with annotations.