More about Roosevelt. He himself told me in an interview.
Once invited a great violinist to play with some university orchestra in the U.S., they do - invite the great with ordinary amateurs to play. There was a student from Russia. And one girl, an American, very much wanted to express her admiration for the great musician necessarily in Rostropovich's native Russian. I asked a Russian student to write this phrase in transcription to learn. And the concert day, the success is complete, everyone is pleased. A student approaches Rostropovich and says:
“Master, well your mother!” our people.