To sample a track, click Play . If you like what you hear, hover over the date and click DOWNLOAD to get an MP3 file. The track will continue to play as you browse the Audio Library. Using the controls on the audio player, you can pause, seek, and play the previous or next track.

More accurately, YouTube Audio Library gives you a free license to use its music, so long as you follow its rules. If you break the rules, you're in breach of the license. If you violate the license, you're technically using the music without the copyright owner's permission, which can get you in big trouble.

Unlike popular and classical music publishers, who typically own less than 50 percent of the copyright in a composition, production music libraries own all of the copyrights of their music. Thus, it can be licensed without the composer's permission, as is necessary in licensing music from normal publishers.