Evan Christopher

Airs Tuesday, March 12 at 9 p.m.  The name of the band refers to Ken Peplowski, a Swing-era specialist; Evan Christopher, a living historian of the New Orleans Creole clarinet; and Anat Cohen — what doesn't she do? They're not the only ones on stage, of course — they'll be backed by a band which knows the time-honored and broad-shouldered methods of swing. This reedy convocation on the state of the clarinet today was put together for Newport, and — on the birthday anniversary of Louis Armstrong — was filled with ad lib fireworks.