How does a composer write music? Whether she pulls interesting sounds out of the air, or creates an elaborate scheme of hieroglyphics – can an uninformed listener tell the difference? Sometimes not, as was the case Wednesday night at the 92nd Street Y where the incomparable Takács Quartet gave the New York premiere of Flow by Nokuthula Endo Ngwenyama. Flow was backed up by an elaborate set of program notes that described inspiration ranging from the sound of the Big Bang to the breathing discipline “Pranayama”. Even with that knowledge in hand, for the most part I couldn’t detect the