In the Clark Library at the University of California Los Angeles, there is a 1691 copy of the printed playbook for Dryden's An Evening's Love: or, The Mock-Astrologer (London: Henry Herringman), which was used as a promptbook in revivals of the play at Drury Lane between 1705 and 1717 (Edward A. Langhans, Eighteenth[-]Century British and Irish Promptbooks: A Descriptive Bibliography (Westport, CT: Greenwood, 1987), 44–45). Amongst other alterations in it, songs are excised and musical flourishes are added (a digitized version is available at https://archive.org/details/dryden_mock_astr_clarklib; see, for example, page 20). It is a comforting object that – when reassessing the recordings made in 2019 by Paul McCreesh and the Gabrieli Consort of Purcell's dramatick operas King Arthur (Winged Lion SIGCD 589, 2019) and The Fairy Queen (Winged Lion SIGCD 615, 2020), for which I performed as a bass violinist and prepared the editions – reassures me that our processes were well grounded.