Is it possible to get sheet music for champion themes, etc?

As a long time LoL player and music nerd, I've always wanted to get my hands on some of the official sheet music for several pieces that have been released over the years. I was so happy when I stumbled across the conductor score for Summoner's Call, back when it was put up on the old forums, but since then, I've felt that more should be released. So many songs, especially champion themes such as Braum's or Jayce's, have such an epic feel to them; that I would love to be able to actually look at and examine the full score to see whats going on to take them beyond just a simple little melody.