This is a great quiz – really nicely done. A couple of small things: at the moment, Leoncavallo seems to require his first name as well as his surname while all the others don't. Second: where there are multiple possibilities, e.g. for St John Passion (Schütz, Bach, Arvo Pärt etc) or Ave verum corpus, it might be helpful to put the date in bracket? Anyhow, really enjoyed this.
Wow, what a comprehensive list! That took some work. I loved seeing Dolly Suite and Wedding Day included. Dolly is a duet I've performed in public (with a partner of course) and I performed a two-piano arrangment of the Grieg which is SO much fun.
Bravo to you!