Well, Mozart is extraordinary not only in that he became virtuoso along the lines of his father, but that he had that compositional gift, that melodic gift. By the time he was four, he was doing piano concertos with harmony in the background.
Twyla TharpOne clear difference between art and commercial work is that commercial work is exploitive: the work may be high quality but the intention is to sell product or tickets. Art exists with or without ticket sales.
Twyla Tharp