Great to see a classical music quiz, and some good questions, but there are all sorts of issues here too. Allow Rimsky-Korsakov (the correct answer anyway) as well as "Korsakov", and also the same with -ff ending. Allow Shostakovich as well as Shostakovitch. It is Grieg not "Greig". Generic titles like "Second Waltz" and "Second Suite" have so many potentially correct answers, and for both the composers concerned there are many better known pieces with titles that haven't been used by others and which would make far better hints. With Weelkes, it would help to give the whole title - it took me a moment to work out what the short title was. Michael Sweeney is a surprising name to see here.
Nice mixture of tough and easy! Maybe also allow Saint-Seans? Today, after a lifetime thinking I knew how to spell it, I learned how it's actually spelt.