The set of six manuscript partbooks known as Regensburg, Bischöfliche Zentralbibliothek, Ms. A.R. 775-777 is one of the most significant sources of vocal music selected and copied for instrumental ensemble in the second half of the sixteenth century. It is unique in containing specified instrumentations—almost certainly written by the original wind players who played from the books—for nearly half of its 120 compositions. The composers represented are some of the greatest names of the century. However, most of the works have never before been made available to modern performers. This edition presents the pieces with specified instrumentation in a format inspired by the original partbooks, with an accompanying score volume on a thumb drive in which the texts have been restored and underlaid to allow performance by either voices or instruments. Edited by Douglas Kirk, David Klausner, and Daniel Stillman.