Beethoven's Missa Solemnis (Solemn Mass) isn't so much a declaration of piety as it is a battle with the Almighty. It's massive. It's unsettling, even thorny in places. Just like the composer himself. Sir Colin Davis led a performance several weeks ago at the BBC Proms in London. We'll hear highlights in today's show. Plus, Sergei Prokofiev's homage to Haydn, his Classical Symphony.