We can use techniques in modifying things, in controlling things, but the first impulse has to be something that you simply cannot make just out of technique, or else it becomes perfectly evident that it is nothing but technique that you're exercising.

Though he gave his last public concert before the age of forty he continued writing music for another half-century and beyond. His performances of works by avant-garde composers and his own innovative and even shocking pieces made him a cause célèbre on both sides of the Atlantic.