Added 4 minutes ago
And here's the second clue solved. Siver - Jadeite.
Isida-aria "O Isis and Osiris" from Mozart's "The Magic Flute" - Viennese Classical School - Beethoven.
Added 31 seconds ago
Why was I such an idiot yesterday and didn't figure this out?
Added 5 minutes ago
Viiiiiiiiiiiiish? Don't you want to join us?