July 14th, 2017, O+A performed their "Requiem" in the Rotunda of Galerius, in Thessaloniki, Greece as part of the documenta 14 festival with Soprano Sarah Chalfy, Mezzo-soprano Hai-Ting Chinn, Tenor Christopher Sokolowski, and Bass Mark Uhleman. The Requiem (for fossil fuels, aka for the Extraction Economy) features an orchestra of city resonances played live over an 8 channel surround system, and the full Requiem text sung by four virtuosic singers in the 4th century Rotunda, with its high dome and Ancient Roman acoustics.