Guillaume Costeley - Seigneur Dieu ta pitié .wmv

Keyboard version using 19-tone equal temperament (according to the composer’s specification). It is Costeley’s only known microtonal composition. More technical information on the computer-generated tuning of this performance can be found in my article at N.B. Please note a correction to the graphic that appears at 1’53“ describing Pitch Depression. The piece in ending on G# instead of A represents an overall pitch depression of two-thirds of a tone, and not one-third as stated. This can be seen with reference to the keyboard layout as shown in the video.