In 1986, Bruce Pavitt was a DJ at Seattle’s KCMU (now KEXP) and writer for The Rocket, when he released a compilation album called the Sub Pop 100. You may have heard of the record label that grew from these auspicious beginnings. Heavily associated with a genre called ‘grunge’ at one point, Sub Pop has continued to evolve since that time, somehow surviving the near-total collapse of the record industry despite releasing albums with titles like Heavens to Murgatroyd, Even! It’s Thee Headcoats! (Already). Bruce is an old friend and he’s on tour with Experiencing Nirvana: Grunge in Europe, 1989, his new photo journal and grunge micro-history of eight days of yore he spent on the road with a fairly quintessential trio of Seattle bands — Tad, Mudhoney and Nirvana. So we asked if he could stop by and hold court in the lobby at Ace New York tonight and he obliged.