CHEW - Astro Teemo Soundtrack (Teemo remix)
It's Astro Teemo Soundtrack from League of Legends: Cho'gath Eats the World game released by Riot.
Astro Teemo is game unlocked by playing CHEW and accessible from CHEW main menu.
CHEW game: http://www.chewgame.com/en/chew/ (i'm not sure, but it may be inaccessible after 1 April 2013)
This video represents Sountrack from it with few screenshots.
Game and soundtrack belong to Riot. I do not own anything