This is a good example of the philosophy that it never hurts to ask. In response to a query from the Music department liaison to the library–who had spotted a notification on Oxford Music Online about an electronic edition of the above-mentioned reference work–the UNR Libraries were able to procure access to the Oxford History of Western Music, compiled by musicologist Richard Taruskin.
This is a mammoth e-book, reproducing all five thick volumes, 1.25 million words, 500 images, and 1,800 musical examples from the updated paperback edition. It is, however, an e-book and not a database, and so you won’t find it on the library website’s databases A to Z page. Instead, I would recommend searching the catalog for it (note that as of this time, the record might be getting processed) or navigating to the Music Library Guide and looking at the “Books” tab, under “E-reference”.
If you have any questions or comments, feel free to offer them below.