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According to a blog post by YouTube, all 46,000 of HFA's music publishers will now be able to license their music for use by YouTubers. Every time a videomaker adds a song to their work (such as a fan video professing undying love for Justin Bieber), an ad will play alongside the vid, scoring the publishers and songwriters money.
YouTube's Content ID system -- which allows the video-sharing site to identify songs in videos -- will be used to locate applicable content.
Previously, YouTube only ran ads next to videos featuring music when copyright holders for both the sound recording and the composition allowed the site to do so. Now, more artists will be able to reap the benefits.