Mache Dich auf, werde Licht is a motet for Advent written by Hans Werner Zimmermann set to Joshua 60, 1-2 in German for SATB and contrabass.
I had the pleasure of singing the bass as a member of Collegium Musicum Bremen during the Advent seasons at the end of the 1990's.
It may be found in Weihnacht published by Verlag Merseburger Berlin.