Music videos on YouTube get more views than other videos because they have Replayability.
How the most viewed video on YouTube Luis Fonsi - Despacito ft. Daddy Yankee had 5.67 billion lifetime views when it is estimated that only 3.5 billion people in the world own all type of computers?
So how can the music video have that many views?
People watch the video once and they find it catchy. Then they throw it on a playlist and watch it a few more times. One person may listen to a single song more than 30 times.