Misc: The protective barrier alongside a staircase or landing?

Questions

In 1853 this virtuoso had to transpose Beethoven's C minor symphony into C# minor. ?

What small town in Upper Franconia is synonymous with the music of Wagner ?

Two of this composer's better-remembered lovers were the Comtesse D'Agoult and Princess Sayn-Wittgenstein. ?

One of Brahm's most difficult pieces is based on a theme by this composer who lived from 1782 to 1840. ?

This Chopin etude calls for extended chromatic runs executed by the last three fingers of the right hand. ?