Directory lists songs and their current policies set by the copyright holders.
Google has launched a new feature in the YouTube Audio Library which allows content creators who use copyrighted music to see what will happen to their videos before they upload them and not as it has been, after. Before this there was no warning at all, all that happened was that if the song had been taken down, one would be confronted by a blank video.
Beginning yesterday, when users uploads a video to YouTube, its Content ID system will automatically try to figure out if you’re using any copyrighted music in it. This service will allow artist and labels to choose to either mute that music, block the video from appearing or monetise the video by running ads against it.
Through this service a user can check and see if the video will still be viewable worldwide and that ads will appear on your video.