Yes is a band that needs no introduction. Four decades. Twenty-one studio albums. The bass part of “Roundabout.” These are the guys who managed to make 20-minute progressive rock epics radio friendly and invented the fine art of the trippy album cover (well, okay, Roger Dean did that, but still). Yes, the lineup’s changed, again—the current iteration consists of Chris Squire, Steve Howe, Alan White, Geoff Downes, and Jon Davison—but don’t let the lack of Jon Anderson dissuade you. Get up, get down, and see these titans of prog rock when they play close by a river, not in but around a lake at Artpark on Tuesday night (July 17). Accompanying the venerated quintet will be another set of the prog pioneers, Procol Harum, an Essex sextet whose 45 years of reputation precede them. Fans of unusual time signatures and the Hammond organ may never witness an opportunity like this again, and all for what it might’ve cost you to see it in 1969. -edward a. benoit
Tues. 17. Yes w/ Special Guests Procol Harum. 6:30pm Artpark. (754-4375/http://www.artpark.net). $5 before 7/15, $10 afterward.