Series of published music, some volumes of which belonged to the composer, or have been used or marked by Imogen Holst in her preparation of revised and new editions for publication; others are marked for performances or recordings. Annotations range from comments, corrections and cuts, to bar numbers, and conducting marks, to large scale editing, alterations of scoring, and rescoring for particular ocassions. Also included are works published after Gustav Holst's death, revised, edited and arranged by Imogen Holst and Colin Matthews, and also works published after Imogen Holst's death. There are some interim materials, including queries to scores and revised scores, proof copies and dyeline copies. Also included are arrangements of Gustav Holst works by others, and scores and parts for unpublished works produced by the Holst Foundation for performance and recording. Some of the works are privately printed.
One copy of each edition of each work published has been archived, except where there are annotations present in which case all annotated copies have been retained. These are in the main full scores and vocal scores and not parts.