About a week ago, a Kansas City native transplanted to Houston e-mailed The Pitch to say he'd only just learned that Music Exchange owner Ron Rooks had died (on August 28, 2006). "It's a great loss to KC. Is the Music Exchange still open without him?" he wrote. I told him no. And really, who would have wanted a Music Exchange without Rooks?Rooks' store was the sort of institution one took for granted in the best way -- it was too big to fail before being too big to fail was a punch line. So for