Blood Moon music

I'm completely comfortable saying this to the public, I adore the music played during the Blood Moon, as well as loving the game mode itself. I went out of my way to try to find the files for the Blood Moon music, but it was to no avail.

I'm clearly missing something here (mostly because I don't know the directory to all of the music files). Is there anyone that can lend me a helping hand or at the very least a hint?