Activision has announced that the Ferret/Metal Blade Track Pack for Guitar Hero World Tour is now available for free for PS3, Xbox 360 and Wii. The Ferret/Metal Blade Track Pack includes the following tracks: "On Broken Glass" by Chimaira, "Dez Moines" by Devil Wears Prada and "Grave of Opportunity" by Unearth. These three songs are available as free singles for Wii.