Seven-time Grammy-winning pianist Emanuel Ax still practices his instrument four hours a day - when you play Carnegie Hall, you don't just wing it. And sometimes, he admits, "it's kind of a slog," especially to practice a new piece: Something written specifically for him, or something he's never heard. "You get the music, and you try to learn it note by note." In an interview with Lifehacker, Ax recommends several ways to make practising an instrument more fun and productive.