Released on May 17, 2012, Straight from the Lab Part 2 is a compilation/collaboration album either by Eminem or other artists in which Eminem is featured. It was released by Koolo, an internet user who leaked many unreleased Eminem songs in late 2011. This bootleg contains the tracks from the previously released Straight From The Vault EP/King Mathers EP as well as other leaked songs, previously unheard by the general public.