instruction:
Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.
question:
Which John Legend song knocked Pharell Willams completely off the No.1 spot on the US Billboard?
answer:
all of me

question:
Which Norwegian band had a hit with 'Manhattan Skyline'?
answer:
a-ha

question:
The Menaced Assassin is a work by which painter?
answer:
rene magritte