Harmony Head Bang

Thanks to WashMachine for this one:

In the early 1930's Schoenberg told John Cage he would tutor him for free on the condition he "devoted his life to music". Cage readily agreed, but stopped lessons after two years. Cage later wrote in his lecture Indeterminacy: "After I had been studying with him for two years, Schoenberg said, 'In order to write music, you must have a feeling for harmony.' I explained to him that I had no feeling for harmony. He then said that I would always encounter an obstacle, that it would be as though I came to a wall through which I could not pass. I said, 'In that case I will devote my life to beating my head against that wall'." Schoenberg later described Cage as being 'not a composer, but an inventor — of genius".