Whose operas include "Tannhauser" and "Tristan und Isolde"?

More Questions:

What country produces Angostura Bitters?

In what US state did Leon Leonwood Bean open his first retail store?

What nationality was composer Ludwig van Beethoven?

Khartoum is the capital of which African country?

What is the average lifespan of the hummingbird?

Trepanation is the practice of drilling holes where?

What is absent in "negative" blood types like O negative and AB negative?

What was the name of the blonde girl in the cartoon show "Scooby-Doo"?

In which decade was the first electric guitar made?

Who played the role of the US president in the movie "Independence Day"?

What is the name of Boy George's 1982 debut album?

What color was Tweety Bird originally?

What TV series about International Rescue pilots was filmed in "supermarionation"?

When was the modern tire first introduced to the market?

"Blackstar" was whose last album, released just days before his death?