Original 1st printing 8&1/2 x 11" concert flyer for Big Brother & the Holding Company (featuring Janis Joplin) appearing at the Matrix in San Francisco, CA from 4/25-27/1967.
 
 Art by Leidenthal, image is featured in the Art of Rock book on page 163 (plate 2.110). 

Thin flat stock flyer is in excellent (B+) condition; there is a small "mouse bite" nip (about the size of a small fingernail) in the upper left margin, along with a whisper of mild edge toning, a tiny pressure crease/nip in the bottom center margin (just beneath the union bug) and a soft handling ding or two hiding within the image area, otherwise it is a FANTASTIC example of this always-in-demand Big Brother concert artifact from the Matrix.