Radcliffe's "Cliffe-Riffs" and Harvard's Krocodiloes will preview their December 3 Symphony Hall debut tonight at 7:30 p.m. when Station WBZ-TV telecasts a 20-minute feature program over channel four.

The show will plug the Harvard Band's concert performance, "Drumbeats and song," and will include two songs by the "Riffs" and eight short numbers by the Krocodiloes.