There's also a fine recorded version by the Dufay Collective (who are just excellent) on their CD "Johnny, Cock Thy Beaver".
http://www.dufay.com/about
http://www.amazon.com/gp/product/B000000AYV/102-2048035-5761724
v=glance&n=5174
)Mea culpa for the lack of blue clickies)
~D