Strange though it is for end-of-year charts to have been coming out since the start of December, that’s the pattern. YouTube launched its Rewind charts yesterday, for example, breaking out separate charts as usual for music and non-music videos. Katy Perry’s ‘Dark Horse’ was the top trending music video globally this year, according to YouTube, using a mysterious metric blending views with comments, likes, shares and parodies to produce its list. Enrique Iglesias’ ‘Bailando’, Shakira’s ‘Can’t Remember to Forget You’ and ‘La La La’, and Jason Derulo’s ‘Wiggle’ made up the top five. Meanwhile, Facebook published its list of the 10 most talked-about entertainers in the US, with music to the fore: Beyonce was top, followed by Pharrell Williams, Nicki Minaj, Taylor Swift and Jimmy Fallon in the top five.