List of Youtube Music Partners?

I often create tutorial videos for Youtube about security issues and I like to use soundtracks as a backdrop. I know there are places where I can download free music legally and use them in my projects, I am also aware that Youtube provides an "Audioswap" feature that I can use. But sometimes I just want to use a commercial, copyrighted music track. I know that Youtube has partnered with a lot of major music companies that will allow you to legally use some commercial tracks in your videos as long as you content-match it and allow advertisements. One video I did used "Clubbed to Death (matrix version)" by Rob Dougan and that was allowed. What I'm asking is where can I find a list of music partners and if possible songs that I can use legally as long as I accept advertisements on my videos?... any help would be appreciated.