The Gilmore Music Library recently enrolled in a free, 30-day trial of RILM Music Encyclopedias, an ever-expanding full-text compilation of over 50 reference works. The free trial begins 2 February 2020 and expires on 3 March 2020.
You can access RME at https://rme.rilm.org.
If accessing from off-campus, be sure to connect using the Yale VPN. Details are available on the Music Databases Guide.