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 near mint (A-) condition; there may be a nearly-invisible handling ding or two hiding within the image area, but to the naked eye it looks just as clean as can be... an absolutely GORGEOUS example of this oft-requested Big Brother concert flyer from the Matrix.