All listed performances have at least one source from those below.
Programmes were found for 28% of the works, mostly in Britain. Some programmes from 1957 onwards were present in Margaret's effects, most of the others in collections at the British Library. The SPNM archives are held in the British Music Collection at Heritage Quay, University of Huddersfield, which has programmes for 21 of the 23 concerts Margaret is known to have played in.
BBC radio broadcasts
Listings in Radio Times between 1923 and 2009 are available online in the BBC Genome. Out of 237 radio broadcasts that identify Margaret as a performer, 76 give no details of the works performed, and some of the others have incomplete information. We have researched these at the BBC Written Archives Centre. Their Artist files have also identified some broadcasts of Margaret's for which the BBC Genome does not give the perfomers. There are 47 taped broadcasts in the British Library Sound Archives, though many do not identify the radio programme.
Swiss radio broadcasts
Programme listings in some regional newspapers and radio/TV guides are searchable online. The majority of those in the 1940s give the performers and works, though premieres are seldom mentioned.
Reviews were found for over a quarter of the works, the majority in The Musical Times or in British and Swiss newspapers whose archives are searchable online. Most information on Margaret's performances before her move to England comes from Swiss newspaper archives.
Scores with Margaret's annotations were available for 18% of works with documented performances. Scores lacking annotations also exist for some works that Margaret probably performed. Almost all are held in the Margaret Kitchin collection at the Royal Academy of Music. From the handwriting, alterations and insertions, and occasional errors in the month or year, we can deduce that the entries were often made many years later; see for example Goehr sonata no.2, Banks violin sonata, Henze concerto and Tippett's The Heart's Assurance.
Recordings exist for 4% of the works. Margaret did not make many commercial recordings and the majority are taped from BBC radio. The Lyrita Recorded Edition Trust has released one radio broadcast on CD (the Hamilton concerto); we hope further releases will be forthcoming.
A Dictionary-Catalog of Modern British Composers, Alan Poulton (2001)
A catalogue of works by 54 British composers born between 1891 and 1923, in three volumes. Gives details of all known first performances (f.p., f.broad.p, f.Brit.p., etc.) of these works. Accounts for 5% of the works.
A Chronicle of First Broadcast Performances of Musical Works in the United Kingdom, 1923-1996, ed. Mitchell and Poulton (2000)
Contains information taken from the BBC Programme-as-Broadcast log. Accounts for 4% of the works. Less complete than the volumes above, as premieres are not always indicated in the logs. Our own scrutiny of the logs (see above) uncovered a few errors and omissions.
Neue Musik in alten Mauern: Die "Gattiker-Hausabende für zeitgenössische Musik" – Einer Berner Konzertgeschichte 1940-1967, Doris Lanz
History of a long-running series of contemporary music concerts in Bern. Includes peformances by Margaret between 1942 and 1950, accounting for 9% of the works. For two concerts in which another pianist took part we are unable to deduce which part of the programme Margaret played; these works are listed in other repertoire.
Some information on Margaret's performances in Switzerland and Europe in the 1940s was found in letters held by the BBC Written Archives Centre.
Advertisements, articles, books, and catalogues. 5% of the works have no other source.