If there’s one thing that rings true, it’s that Sigur Rós looked as if they could have been plucked straight out of a Stumptown coffee shop. The Icelandic ensemble, with their uniformly unkempt hair and five-o-clock shadow, just have that aesthetic. But, if they hailed from PDX and not Reykjavík, they’d arguably be one of the many local bands that you listen to once—and promptly forget. If you were present a...