Volume 1 of the League of Legends soundtrack is now available to download, for free.
'The Music of League of Legends, Vol. 1' includes "soaring scores and victorious anthems" across 15 "new and classic" tracks.
I haven't played League of Legends for well over a year, I think, and I never played it that much either, so the music isn't exactly prevalent in my mind. But, you can listen to one of the tracks in the first video below, complete with animation to give yourself a taste of what's on offer - it's extremely good. And the second video is a documentary about the creation of the music.
Thanks, PC Gamer.