Gnarls Biggie is a mashup album created in the same vein as an album featuring what two surviving Beatles?
Gnarls Biggie: is a hip hop mashup album created in the same vein as Danger Mouse's "The Grey Album". The Grey Album: The Grey Album is a mashup album by Danger Mouse, released in 2004. The Grey Album:  "The Grey Album" gained notoriety when EMI attempted to halt its distribution despite approval of the project from Jay-Z and the two surviving Beatles, Paul McCartney and Ringo Starr.
Paul McCartney and Ringo Starr