At eight o'clock I went with Mama to play vint with the Andreyevs, and then after an hour went on to the Belyayev Concert to hear Tcherepnin's ballet Narcissus and Echo. This is a very interesting work, with a good deal of captivating music in it, although here and there it descends to somewhat derivative, wishy-washy pictorial representation. But on the whole it is an extraordinarily appealing and in places absorbingly interesting work. The ballet had a success, and we conducting students of the composer took along a big bouquet of narcissi, ingeniously chosen by Gauk. When we entered the artists' room, which was packed with people, we congratulated our professor on his triumph. I said, 'That was an incomparable object lesson in orchestration!'