Dominion Music 6th Track? Dominion Ingame Files?

So I was recently playing Dominion, and we got around the point where both teams were under 25-40 hp, and another transition came on and It was the most beautiful thing I heard. It consisted of high singing and intense music and I loved it. Then the game ended a few seconds later. So I looked online to see where I could find it, and apparently nobody heard it before. So I looked in the files and tried to look for it, but I found nothing.

So I did what another normal band geek would do. I purposely stalled the game until it got to that point where the music came along and I just tried to stall as much as I could to listen to it.

Sure I lost. But I enjoyed the music.

My Question is, does anybody know what kind of music I'm talking about and where could I find it? And could I find any other dominion music in the LoL files? Thanks.