Dear Editor, Hats off to Jay Trachtenberg for his positive criticism of the latest Bad Plus recording, Give ["Phases & Stages," Music, April 2]. I so often appreciate his informed and intelligent sense of perspective. If the jazz purists had a fraction of the senses of adventure and humor of these three individuals that possess such remarkable musical character and instrumental facility, perhaps the lion's share of the world wouldn't damn near ignore the only truly American art form that has ever existed. And, everyone would tell stuffed-shirt traditionalists like Wynton Marsalis to shut the fuck up (I'm allowed to fantasize, right?) and look forward to the future while possessing a reverie of the past (long live T.S. Monk and the 'Trane, among countless others, for blazing the trails). Thanks again, Jay, for giving a band with such an original voice some coverage.