Its hard to believe but I wrote this arrangement way back in 2008—its finally come to fruition 12 years later*... This arrangement is based on a choir piece by Robert Graham. Its a beautiful piece with a a good amount of counterpoint. I've arranged it for 8 trombones and pipe organ (basically two quartet bone choirs of 4 each).
This recording sadly shows my age - truth be told, back 15 years or so I had a pretty good high range and could nail up to a high F. These days I barely squeaked out the Eb and the high notes at the end I must confess were digitally transposed.