I have more stats on how big YouTube is for music. Because YouTube is the biggest online source for music by parsecs and parsecs, you can be seen by a lot of people very quickly—if you have a hit song. Pop music—because of its mass global appeal—will always have the most popular YouTube videos. The king is currently Psy’s “Gangnam Style” with just under 2.5 billion views. The biggest alt-rock hit is “Somebody That I Used to Know” from Gotye with slightly less than 700 million views. That’s good for 31st place. Lorde’s “Royals” is 66th spot with 523 million. And the highest-ranking pure rock track is at #85. Any guesses? “November Rain” by Guns ‘N Roses with 451 million.