Its getting close but not there yet. What am I talking about? The official video from the Furious 7 soundtrack.
At time of going to press it was at 2,902,472,946 views (ish);
'Gangnam Style' by PSY, was launched 4 years ago and has just 5 million less views. As I mentioned back in 2014, Gangnam Style Breaks YouTube, and FYI, it is still a very catchy tune:
Justin Bieber comes third with his single 'Sorry' with only 300 million less, although it should be noted that the video is for a music single, not a movie, nor for a tribute to a dead actor. As I am not a teenage girl I am not qualified to judge Justin's talents, sufficed to say, 'well done young man'. Oh, and he isn't even in the video!
Which is a mere 300 million more than Maroon 5's 'Sugar' ;
So I guess we can conclude that music is the reason most people flock to YouTube. YouTube is wanted more for it's audio than it's video - interesting, very interesting!