Mozart may have died at just 35 in 1791, but he left behind a catalog of such scale, depth, and variety that even hardcore fans often admit to having simply scratched the surface. Beyond the late symphonies, piano concertos, and major operas there’s a wealth of music waiting to be explored, from rarely performed chamber and choral gems and music written for Masonic lodges to startling early works composed when the Austrian genius was barely into his teens.