In one of the more peculiar concerts that I have been to at the Royal Festival Hall, Vladimir Jurowski conducted excerpts from Das Rheingold in the first half of the programme, and Rachmaninov’s little-known opera The Miserly Knight in the second half. The idea, I gleaned from a pre-concert chat by the conductor and others, was that the first half would shed some light on the second, showing that although Rachmaninov, at one time an industrious operatic conductor, almost certainly never conducted Wagner, he was strongly influenced by him.