According to a YouTube blog post, the 46,000 music publishers HFA now be able to license their music for use by YouTube users. Every time a filmmaker add a song to work (for example, a fan video professing undying love for Justin Bieber), an ad to play off the vine, scoring publishers and composers of money.
Content Identification System from YouTube - which allows the video-sharing site to identify songs videos - is used to locate appropriate content.
Previously, YouTube only ran ads next to music videos when copyright holders for both sound recording and composition allows the site to do so. Now, more artists will be able to reap the benefits.