The fantasy in a is one of Byrds most well known pieces for keyboard. Two sources are important: the Fitzwilliam Virginal Book and a manuscript in the hand of Thomas Tomkins. Because existing editions rely heavily on the one or on the other, a new edition is made, offering a practical edition for both sources as well as a synthesis of both. The performer can choose for himselves. In this edition the appearance of the beaming is left untouched as much as possible. Introduction is in Dutch. 27 p.