““The basic task performed by the credit rating agencies was to strip derivatives of their individuality. Whether it was David Bowie pioneering securities derived from the perpetual value his music had created or a 30-year conventional mortgage, once a credit rating had been assigned, investors were agnostic. Bowie’s AAA-rated royalties and the AAA mortgage on the house next door were interchangeable, or as Gorton said, “informationally insensitive.””