Spoiler alert: As some point during their show at the Greek Theatre in Berkeley on Friday, The Decemberists will make a major theatrical production of “The Mariner’s Revenge Song,” the expansive sea shanty/revenge tale from their Picaresque album that is one part biblical, one part Moby Dick, and one part Pinocchio. That rendition will be entertaining, expertly-crafted, and, for anyone who’s ever attended a Decemberists show, warmly familiar. Basically, it’s a summation of the band. https://www.youtube.com/watch?v=Yb8oUbMrydk Their geek-rock credentials now firmly established (this is the group that sings about boys in knickers, makes rock operas about doomed romances between man [...]