YouTube has become the defacto place to find just about anything and, while cat videos remain popular, music is also a big part of the service. Users seem to flock to the place to watch music videos by major artists that sometimes go viral, as well as unknown people who become memes.
YouTube spent some time reminiscing about its memorable past in an announcement of the birthday celebration. "To call out just a few highlights in YouTube history, there are more than 120,000 videos inspired by 'Let it Go' (based on videos posted with that title), half a million by 'Gangnam Style,' and a stunning 1.5 million videos by 'Harlem Shake' (that’s a lot of motorcycle helmets).
These inspired riffs got us thinking about those magical moments when songs become bona fide trends—and people all over the world start remixing, covering, parodying, dancing, and lip-dubbing", says the company's Claire Stapleton.
Now, for the ninth birthday of the Google-owned video site, a collection of artists have come-together for a star-studded karaoke video. 18 artists appear in the four minute clip.