“The dream of the ’90s is alive in Portland,” the satirical TV show “Portlandia” proudly sings — that dream being to form a rock band and save the planet while letting your precious individualism hang out in all its eclectic glory. Cover yourself with artistic tatoos, go to clown school and clamber up on that double-decker bike — why not? Maybe the dream of the ’90s is really the recycled dream of the psychedelic 1960s, when rock bands and revolution — both political and personal — became a way of life.