Misc: Aside from Brussels, What other city contains the EU's main governing bodies?

Questions

The marimba is a deeper toned form of which instrument?

Which Bonn musician left for Vienna in 1792 to study Haydn?

Who helped George Harrison produce 'My Sweet Lord'?

What term was used from 1914 onwards to describe music emanating from New Orleans?

In which field did Wayne Sleep achieve fame?