Misc: Who is the great-grandmother of King David?

Questions

Which work was not written by Richard Wagner ?

What virtuoso pianist had to turn to composing after he injured his hand when he tried to strengthen his third and fourth fingers using a self-invented apparatus ?

Which well-known composer was confined to an insane asylum in Bonn near the end of his life ?

Name the composer who tried to commit suicide by jumping in the Rhine. ?

What composer was famous for his Polonaises ?