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A good drummer knows not only the code messages, but code names for some 200 people. Sometimes in the early morning, when sound travels best, he will make a roll call of all important people in the district. Dr. Good passes on some good advice for drummers: "Don't lean over the drum or its sound will be muffled. Look in the direction you wish the sound to go. A good drummer must not eat chicken wings, give them to someone else."