Misc: Who won Best Supporting Actress for her role in Melvin & Howard?

Questions

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" ?

Who composed the piano piece, "Liebestraum" ?