Misc: Which French city is famous for its production of mustard?

Questions

In the music of J.S. Bach, one can find evidence of...?

In 1705, J.S. Bach was exposed to a composer who influenced him greatly. Who was he?

Leonard Bernstein's last minute conducting debut with the N.Y. Philharmonic in 1943 launched his career. Who was he filling in for ?

The story behind Wagner's Der Ring Des Nibelungen is drawn from...?

Which work does not belong in the following list?