Misc: alex and his 'droogs' are thugs in what anthony burgess novel?

Questions

Chopin and George Sand hoped to have an idyllic holiday on this island paradise. Instead it turned into a nightmare. Name this island. ?

An American popular-song composer based this hit song on Chopin's Fantasie-Impromptu. This tune is: ?

Who wrote the "Unfinished Symphony" (in B minor) ?

80 years after his death, Bach was all but forgotten by the general public. Which composer is credited with reviving interest in Bach after his death. ?

Who composed "Clair de Lune" ?