Misc: What is the link between the actresses Mia Farrow & Maureen O'Sullivan?

Questions

The "Peer Gynt Suite" was written by: ?

The Rakoczy March is named for the leader of what country's campaign against Austria ?

What composer wrote a piece which became the nationalanthem of two different countries ?

The opening line of this song asks, "My God, Why hast Thou forsaken me" ?

What composer was born in Rohfrau, Lower Austria in 1732 and dies in Vienna in 1809 ?