If we were to make a time capsule of pop music in 2012, what would be included?
When the year began, who knew a Korean pop star and a Canadian Idol runner-up would have some of the biggest hits this side of the millennium?
And what about the flow-on effects of TV shows like The Voice and The X Factor, for both winners, losers and the judges?
Some things stayed the same Madonna is still riling people up, Justin Bieber has as many teenage girls screaming for him as last year, and boy bands are back in vogue.
So, join us as we figure out the 20 things we've learnt from pop music in 2012: