This compilation of material begins with an article by Terence Charlston examining the Theewes claviorgan in detail, and how an instrument of this type might inform our view of the solo repertoire of the time and change our understanding of keyboard instruments in ensemble performance.

It also includes an inventory of surviving claviorgans and a series of short recordings of the Goetze & Gwynn reconstruction of the Theewes’s organ part combined with a Flemish-style harpsichord by David Evans.