Which Artist Had the Most Watched Music Video on YouTube in 2015?
This year we were blessed with some amazing music, but what topped all those singles were their viral music videos. Adele blew us away with her chilling new single, "Hello," and Taylor Swift's "Bad Blood" was practically a star-studded minimovie. But, of course, there were so many others. Check out YouTube's top music videos of 2015 and then relive all your favourite hits from this year with this perfect mashup.