You would think that a performer who is truly moved by the music s/he is playing would be exactly the kind of performer an audience would want most to hear. But in reality, emotional connections can be both a blessing and a curse for performers, who must battle “trembling limbs, nerves, [and] memory problems. All these can intrude between the musician and the music, and between the music and the listener. Some of the most outwardly emotional music requires enormous control.”