This morning we heard music by Mario Castelnuovo-Tedesco. Because of anti-Semitism in his native Italy, Castelnuovo-Tedesco’s music was banished from Italian radio. He emigrated to the U.S. in 1939 and eventually became an American citizen. It was during that stressful year of 1939 that Castelnuovo-Tedesco wrote a concerto featuring an instrument for which he was to write dozens of works. What instrument is that?