''What Is Jazz" was the title of the three-hour music extravaganza at Berklee Performance Center Saturday night, and the genre-bending artists involved -- the Christian McBride Band, the Charlie Hunter Trio, DJ Logic, and Bobby Previte -- offered an intriguing, chops-heavy testing of the music's boundaries reminiscent of jazz-rock fusion's 1970s heyday.
Previte and his electronic drum set were served up first as an appetizer, the drummer building an eerily futuristic composition by striking his sample-linked drum pads. Previte's piece was the furthest removed from familiar jazz of anything played all night, and at a half-hour in length it sometimes seemed overlong. But every time one's attention would begin to wander, Previte would call it back with some surprise. At one point, a disembodied voice intoned, ''We have the terrorists on the run. Keep them on the run" several times, which bled into the drone of a muezzin calling the Muslim faithful to worship.