Busch was not a teacher in the accepted sense of the word; one could take him as a model, but he himself could not develop a tender talent.

Flesch was like a doctor – if something was not right with your technique, he would give you a pill; and if that didn't work, next time he would give you another pill. I would get inspired sometimes by a performance by Flesch, because of something in the way he played it. With Busch it was something in the spirit of his performances that thrilled me. He talked about projecting the music – he did not talk much about technique.

After three years of Flesch, it was quite a relief to go to Busch, as Flesch had concert-like lessons – there was no privacy. Class teaching is all right within reason, but with Busch it was more human. He was a marvellous man in his own way, a very straightforward kind of individual, though he did not do all that much different from what Flesch did. He had certain opinions about Flesch's teaching, but in the meantime Flesch had changed his mind! I thought Busch was extraordinarily good on the musical level.