A beautiful art nouveau influenced concert poster advertising The Band, Muddy Waters, the Butterfield Blues Band, John Sebastian, and Delaney & Bonnie at the June, 1971 'Open Air Celebration' in Minneapolis, MN. We have never seen another example of this poster, which features artwork by Anne C. Elliott, and is in near mint condition. An extraordinary lineup and a stunning poster. 17 ½' x 22 1/2.'