Two weeks ago we posted CDZA’s “Journey of the Guitar Solo,” an entertaining tour of 50 years of rock and roll guitar playing. Now we’re back with the group’s follow-up, a fast and fun introduction to drums. New York-based drummer Allan Mednard takes us on a quick tour of the instrument, demonstrating the basic differences between jazz and rock drumming and showing how they have evolved over time. CDZA, short for Collective Cadenza, is an experimental music video project of a group of highly skilled musicians in New York. For more examples of their work, visit the CDZA Web site.