Few movements produced such a high concentration of musical forces as grunge. It’s not outrageous to posit that something especially groovy must have happened in Washington State in the late 1960s when most of the Seattle scene’s influential innovators were born. Of course, the ultimate champion from this celebrated set was Nirvana leader Kurt Cobain. “Look at a band like Nirvana,” Bruce Springsteen told Guitar World in support of this notion.…