Anyone entering Blueberry Hill’s Duck Room on Tuesday night may have been surprised to find a crowd that looked more appropriate for Taste of St. Louis than punk pioneer X, who slated to perform. With the exception of one woman in leather pants and a patrolman-type hat (as well as the perpetually costumed Beatle Bob) cargo shorts and polo shirts dominated an audience whose median age could be pegged somewhere in the mid-fifties.…