A painter hangs his or her finished pictures on a wall,and everyone can see it. A composer writes a work ,but no one can hear it until it is performed. Professional singers and players have great responsibilities, for the composer is utterly dependent on them. A student of music needs as long and as arduous a training to become a performer as a medical student needs to become a doctor. Most training is concerned with technique, for musicians have to have the muscular proficiency of an althlete or a ballet dancer. Singer practice breathing everyday, as their vocal chords would be inadequate without controlled muscular support. String players practice moving the fingers of the left hand up and down, while drawing the bow to and fro with the right arm----- two entirely different movement. Singers and instrumentalists have to be able to get every note perfectly in tune. Pianists are spared this erparticular anxiety , for the notes are already there, waiting for them, and it is the piano tuner's responsibility to tune the instrument for them. But they have their own difficulties. The hammers hit the string have to be coaxed not to sound like a percussion, and each overlapping tone has to sound clear. This problem of getting clear texture is one that confrots student conductors: the have to learn to know every note in music and how it should sound,and they have to aim at controlling these sounds with fanatical and selfless authority. Technique is of no use unless it is combined wiht musical konwledge and understanding. Great artists are those who are so thoroughly at home in language of music that they can enjoy performing works written in any century.