Dohnányi thrived on such responses. He was as sympathetic to the Second Viennese School of Schoenberg, Webern and Berg as he was to the first of Haydn, Mozart and Beethoven. Moreover, he was emphatically not in the business of entertainment or fun. “Is it fun to read James Joyce? I don’t know, but it’s great,” he mused in another interview. His wish was always to debate, discuss and explore — and not only music but also politics, ideas and the arts more generally. His British debut had been in 1965 conducting Mahler’s Fifth Symphony with the London Philharmonic Orchestra. “His...