Jeremy Denk has his own personal "piano boot camp." Actually, it's his cramped Manhattan apartment. Beside his beloved books, a trusty coffee pot and a laptop, there's not much to do except practice. Which Denk does, hours and hours a day on a Steinway wedged into his living room. On a good day, he brews pot of coffee number one at about 11, then plays for about five hours. Perhaps a run to the gym, then pot number two is brewed at about 6, followed by more playing — until the neighbors complain.