The act of keeping a beat when music is unavailable. The beating of the fist and the use a handheld object such as a coin, pen, comb, ect. is comonly used in a pattern to make a beat.Sonds can also be created with the mouth and throat.
Urban knocking would be viewed as the beating of walls, tables, concrete, buckets, or any surface with a good thump to harness a basic rythym.
28 september 2005