A recent study by the National Endowment for the Arts found that jazz audiences have been getting smaller and older, and Terry Teachout pondered the reasons for these stats in a Wall Street Journal article this weekend . Jazz is now considered a serious art form, but this new status has come at a cost according to Teachout, alienating popular-music audiences that skew young. Once a part of everyday cultural life for the hip, jazz is now a stuffy museum piece, one that shares the problems facing orchestras, museums, and other high-culture emporiums. Comparing jazz to classical music, I'd say that jazz faces a distinct problem: most of its major art works are recordings. Although there are umpteen-thousand excellent recordings of all major classical pieces, orchestras can always pitch the live performance as the most authentic experience possible of the score. (Whether they do this well or not is another story.) Jazz presenters, on the other hand, can't present ...