Adele's 21 is featured in today's search for the Greatest Album of All Time.
In the meantime, we thought we'd test your knowledge of 21 by Adele. Take the quiz below or scroll to the bottom for a video of the moment Adele became a superstar; her spine-tingling performance of Someone Like You at the 2001 BRIT Awards.
Watch: the moment Adele became a superstar...
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