EVANSTON—Up-and-coming composer Johannes Brahms keeps pumping out the pop hits, but some of today’s hippest youths simply are not buying it. Despite the popularity of his breakout hit “Piano Concerto No. 1,” these so-called hipsters are avoiding Brahms at all costs. “He’s just so commercial, you know?” said 19-year-old Bartholomew Hibbons. The youth, sporting straightened black mutton-chop sideburns, continued, “It’s just so predictable. Honestly, if I hear another A minor with a raised sixth and augmented ninth chord I think