Letter, 22 October 1952, London, Gordon Steele to Mary Grierson. Informing Grierson that Steele has become a full time singer and part of a group called The Renaissance singers and details of his engagements. Holograph signed, with stamped envelope, with concert programme, ' Music of the 17th & 18th centuries.

Letter, 13 June [n.y], London, Gustav Holst to Mary Grierson. Informing Grierson of his fee and inviting her to dinner. Holograph signed.

Letter, 29 November 1926, London, Gustav Holst to Mary Grierson. Thanking Grierson for inviting him and praising her performance of one of Holst's favourite symphonies. Typescript signed.

Letter, 12 February 1952, London, Hubert Foss to Mary Grierson. Praising Grierson's biography of Tovey. Holograph signed.

Letter, 24 March 1952, London, Hubert Foss to Mary Grierson. Discussion of a publication of a work on Tovey's markings and ways of interpreting them. Typescript signed, with envelope.

Letter, 13 July 1963, London, Julian Jeffs to Mary Grierson. Returning correspondence between Maurice Baring and Tovey to Grierson. Typescript signed.

Letter, 2 March 1952, London, L. Zwingli to Mary Grierson. Congratulating Grierson on her biography of Tovey and enclosing some articles on Tovey. Holograph signed, with stamped envelope.

Letter, [n.d], London, M. Brown to Mary Grierson. Praising Grierson's biography of Tovey. Holograph signed.

Letter, 27 March 1952, London, Mabel McCormick to Mary Grierson. Praising Grierson's biography of Tovey. Holograph signed.

Letter, 18 January 1952, London, A. Peacock, for Geoffrey Cumberlege, Oxford University Press to Mary Grierson. Sending Grierson an early copy of her book on Tovey. Typescript signed.