Adult Swim is offering a FREE download of “16 tracks of rare or unreleased metal from the heaviest bands in existence.” Featured bands include Black Tusk, Red Fang, and Withered.

The entire album download is an MP3 ZIP file. It’s about 146MB, so it will take a bit of time to download if you don’t have a really fast connection.

Adult Swim features lots of animated shorts for boys who never grew up; as its name suggests, however, it’s for adults, not kids.