I used one of YouTube's copyright free tracks once. A few months later the track was claimed and my video's audio was wiped. You're better off checking the search tool at the bottom of video manager to see if big name songs have monetization sharing enabled. Unless you have written permission from the artist, any track could go from royalty-free to claimed once the artist signs with a label.Youtube has some awesome free music to use.
Do you guys know of anywhere else we can find some free music?