Nice snake. Alice Cooper and friend are among the many rock ’n’ roll luminaries captured by the lens of photographer Robert M. Knight. From Elton John to Green Day, from a young Rod Stewart to good ol’ Jimi Hendrix, a batch of Knight’s images are on display in the exhibit 40 x 40, at the Symbolic Gallery, 4631 Dean Martin Drive. Hours: noon-8 p.m., Wednesdays through Sundays, through February 29.