NBC NEWS   » And the Beat Goes On More than 20 percent of the coronary bypass operations in the country are done 'off pump,' with the heart pounding in the chest like the living thing it is. Adam Friedberg for Newsweek This patient's hearts wasn't stopped for quintuple bypass By By David Noonan Newsweek July 11 issue - Five minutes after you meet Joel (Barlow) Davis, it feels as if you've known him for years. As open and affable as a handshake, Davis, a retired country-music bass player and singer, wasn't trying to fool anyone the night before he underwent a quintuple heart bypass at Emory Crawford Long Hospital in Atlanta in March. "I'm calm, but I'm scared," he said. "I really am." To relax, Davis, 68, harmonized with his companion Peggy Stone on a verse of "Amazing Grace" as his daughter, Marsha, smiled and wiped away tears. Earlier, h

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