Playboy dubbed him "the coolest man who ever lived" and Elvis Presley worshipped him. That man was Rat Pack legend Dean Martin.    A famed star of the silver screen and television, the Grammy Award ©-winning singing sensation Dean Martin's show business legacy is legendary. His effortless vocalizing has become a modern-day shorthand for cool and his warm sensuality of his voice continues to beguile new generations of music fans with a winning style and a romantic touch of mystery and, simply put, he was one of the greatest recording artists of all-time and a true musical icon.