"You did it again!"

From Charles Rosen’s Piano Notes —

Milton Babbitt had developed a large repertoire of the subtly noncommittal: a good sample was 'You did it again!' The compliment offered to me by another pianist that perhaps gave me the greatest pleasure was one given after a concert in Paris: 'Congratulations on your great success in New York!' (a recital that had been written up with two columns and a picture in Time magazine). The greatest formula of all had been developed by Nadia Boulanger, who, I am told, would come backstage, hold your right hand in both of hers, look you straight in the eye, and say, 'You know what I think!' (Vous savez ce que je pense!)