Folder 1:

Letters to Harris, mostly congratulating him on reaching his 90th birthday.

Correspondents include: Sir Adrian Boult, Laurence Bowen, Sir John Dykes Bower, Sir Ernest Bullock, Sidney Campbell, Sir Keith Faulkner, Douglas Fox, Rosalind Fynes-Clinton, Richard G. Greening, Herbert Howells, Francis Jackson, Gordon Jacob, Sir Alan Lascelles, Mary Ley (widow of Sir Henry), Richard Seal, Herbert Sumsion, Alwyn Surplice and Gilbert Thurlow; telegrams from H.M. Queen Elizabeth II, H.M. The Queen Mother and the Incorporated Association of Organists.

Folder 2:

Greetings cards received by Harris on his 90th birthday.

Folder 3:

Greetings telegrams received by Harris on his 90th birthday.

Folder 4:

Replies received to an invitation to attend a special 90th Birthday Evensong and recital at St George's Chapel, on 27 Mar 1973.

Correspondents include: Sir Thomas Armstrong, John Birch, Sir John Dykes Bower, Sir Ernest Bullock, Sir Sidney Campbell, Nicholas Danby, Harold Darke, Maria Donska, Timothy Farrell, Sir Keith Faulkner, Christopher Hare, Francis Jackson, Sir Anthony Lewis, John Morehen, Bernard Rose, Herbert Sumsion, Alwyn Surplice, George Thalben-Ball, Sydney Watson, David Willcocks.