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<p>Drummers, especially the best ones, have a secret. In performance they're the coolest musicians on stage, T-shirt clad free spirits who drive the music forward with passion and pyrotechnics. In the privacy of the practice room, though, they come dangerously close to nerd territory, laboring to perfect wonky drum “rudiments” with names like the “ratamacue,” the “single dragadiddle” and the “inverted flam tap.”</p>