An original 1990 concert poster for Nirvana as the opening act for headliner Sonic Youth and STP appearing in Portland and Seattle. With artwork by celebrated artist Raymond Pettibon, this poster had been frequently bootlegged, but this is an authentic 14' x 18' first printing original. Sonic Youth famously recommended Nirvana to their Geffen Records A&R person, which resulted in their signing—and a revolution in popular music. This poster catches Nirvana at the beginning of their mainstream career, playing Seattle—the homebase for grunge. In near mint condition, with a soft, barely noticeable diagonal crease across the middle.