Name
- Curwen Press, printing press, 1863-19841
- Mairs, Sybil, of Kingston, Jamaica; correspondent of Boosey and Hawkes Ltd., fl 19371
- Mansel and Company, of Dublin, Ireland, fl 19381
- Mason, Dorothy G., of Chesterfield; correspondent of Boosey and Hawkes Ltd., fl 19381
- Matthay, Tobias Augustus, pianist, 1858-1945, http://isni.org/isni/000000...1
- McCormack, John, Irish tenor, 1884-19451
- McEachern, Malcolm, Australian singer, 1883-19451
- McLellan, John, of St. Margaret's Central School, Anfield, fl 19381
- McMullan, D. H., of Diss Secondary School, fl 19381
- Moir, Arrol, 2nd Baronet, of Whitehanger, correspondent of Boosey and Hawkes Ltd., 1894-19571
- Wallace, Cedric, American jazz double-bassist, 1909-19851