Shoeless Trivia: Episode 199 (Belgium)

I was having trouble coming up with a topic for today and you know what they say: When in doubt, think Belgium.

1. What musical instrument, featured prominently on the 1960 album Giant Steps, owes its existence to a Belgian named Adolphe?
2. The 2 euro coin see here features an image of what Brussels landmark?
3. Though it was named by Fred Hoyle, the Big Bang theory was first proposed by whom? The theory faced prejudice early on because its originator was a Catholic priest as well as a scientist.
4. A street in Brussels was renamed “Ceci n’est pas une rue” to honor what surrealist painter?
5. A treaty signed in Ghent in the early part of the 19th century ended a war between what two primary belligerents?