2-3 Weeks. 45 Day Lowest Price - 100% Satisfaction Guarantee. After 11 years and over 700 drumming exhibitions, Bobby Rock makes an explosive return to the video arena with this video, The Zen of Drumming. In this groundbreaking three-hour production, Rock shares a lifetime's worth of drumming knowledge and inspiration as he bases the program on his innovative mind, body and soul approach to peak performance.