You are perfectly right in your criticism about Kussevitski’s performance of my Variations, op. 43B. Some of the shortcomings of this performance derive directly from his disregard of my metronomical indications. Why he did this is unimaginable to me. At least so far he need not have failed. (…)/Yesterday I received a record of it and today I got the Boston reviews. The record is bad enough. One hears almost no strings, but an astonishing amount of brass and tuba.