Music fitting to the gameplay of League of Legends

I recently went through the soundtrack records of mine and started to wonder what music might be best to listen to while playing League and also wonder what other people might choose. In my opinion, the good old soundtracks from "Age Of Empires" fit best. Calm, but slowly building up tension over the course of the game. League of Legends is a rather slow paced game about skirmishes for the most part after all, where you as the player are acting from the position of an observer.
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