The composer Jean Sibelius is arguably as important to early 20th-century music as Ezra Pound was to literary modernism. Now, more than 50 years after the Finnish composer died, in 1957, at the age of 91, a musicologist in Texas is claiming that Sibelius was culpably entangled with Nazi Germany, and should join Pound, Richard Wagner, and Louis-Ferdinand Céline in the select group of artists who have been cast into anti-Semitic ignominy...