1. MS Mus. 1804/1/4/2 Reference (shelfmark): MS Mus. 1804/1/4/2 Title: Thea Musgrave: 'The Decision', opera. Draft Collection Area: Music Collections Languages: English Date Range: 1965 Extent: 3 volumes
2. MS Mus. 1804/1/4/5 Reference (shelfmark): MS Mus. 1804/1/4/5 Title: Thea Musgrave: 'The Decision', opera. Main vocal score Collection Area: Music Collections Languages: English Date Range: 1965-1967 Extent: 3 volumes
3. MS Mus. 1804/1/4/3 Reference (shelfmark): MS Mus. 1804/1/4/3 Title: Thea Musgrave: 'The Decision', opera. Full score Scope & Content: Full score, on transparencies. The text on the title-page for each act is printed. Collection Area: Music Collections Languages: English Date Range: 1965 Extent: 3 volumes