Art by David Singer, image is #227 in the Bill Graham/Fillmore series. Medium glossy stock poster is in beautiful near mint (A-/B+) condition; just a few scattered small fingerprints and a tiny vertical/diagonal scratch in the top right margin, otherwise fine. An overall very crisp example of this beautiful 1st printing Fillmore poster. Miles' band (the "Bitches Brew" band, for the most part) at the time included jazz heavyweights Chick Corea, Jack DeJohnette, Steve Grossman and Dave Holland, along with percussionist Airto Moriera, who would later go on to participate in several world music projects with GD drummer Mickey Hart. You can stream the Dead's set from 4/12 here:

http://www.archive.org/details/gd70-04-12.sbd.kaplan.3820.sbeok.shnf