Hybrid Theory (EP)
 Hybrid Theory is the first EP by Linkin Park when the band was known as Hybrid Theory. The album was recorded and self-released in May 1 1999 through Mix Media. Later that year the band changed its name to Linkin Park and Hybrid Theory was re-mixed and remastered for another limited release in 2001 (with minor changes) in the credits and artwork for members of Linkin Park's fan club. Only about 1000 copies were pressed and released.