The Thesaurus Musicarum Latinarum (TML), subtitled an “Online Archive of Music Theory in Latin,” is among the handful of online resources that early music scholars consult with frequency—the other two being the Digital Image Archive of Medieval Music (DIAMM, an image archive and catalog of manuscripts transmitting medieval polyphony) and the Cantus database (a searchable catalog of plainchant).1 All three were first developed in the earliest days of web-based scholarly resources, and all three have shed their HTML 2.0 look-and-feel courtesy of recent updates to their interface design. This review considers the newest version of the TML, released in 2017, focusing both on the improvements in usability and functionality of the 2017 version, and on the aims and scope of the TML project in general.