What rock band featured Dave Grohl as the drummer before he founded Foo Fighters?

Nirvana

What is the name of the kingdom in Disney's Frozen? What musical film features Hugh Jackman starring as P.T. Barnum? What instrument has black and white keys? What name is given to the annual championship game of the Canadian Football League? What soccer club in Germany has traditionally served as Bayern Munich's key rival in the 'Klassiker'?