Question: Gnarls Biggie is a mashup album created in the same vein as an album featuring what two surviving Beatles?

Context articles: Gnarls Biggie
Birthday (Beatles song)
En Toda Libertad
The Grey Album
Mouth Sounds
Mouth Moods
IPunx
Incorporated (Legion of Doom album)
The notorious xx
Pet Sounds in the Key of Dee

is a hip hop mashup album created in the same vein as Danger Mouse's "The Grey Album".
 It was produced by a group of Brooklyn-based DJ's known as Sound Advice.
 The album features 11 songs in which the tracks of Gnarls Barkley are cut-up into beats and then layered with raps of The Notorious B.I.G. It was released on July 17, 2006 on the website gnotorious.com and was featured on the websites of the music magazines "VIBE" and "Spin".
 There was also a promotional video released on YouTube.
 Its album cover parodies the cover of The Notorious B.I.G.'s "Ready to Die" by replacing the baby's head with Cee-Lo's head.
 All of the tracks on the album use beats that sample Gnarls Barkley's album "St. Elsewhere".
"Birthday" is a song written by Lennon–McCartney and performed by the Beatles on their double album "The Beatles" (often known as "the White Album").
 It is the opening track on the third side of the LP (or the second disc in CD versions of the record).
 The song is an example of the Beatles' return to more traditional rock and roll form, although their music had increased in complexity and it had developed more of its own characteristic style by this point.
 Surviving Beatles McCartney and Ringo Starr performed it for Starr's 70th birthday at Radio City Music Hall on 7 July 2010.
En Toda Libertad (in English: In All Freedom) is the thirteenth album released by the Mexican rock band Maná.
 It is a remix/tribute album, fanatically constructed and includes songs from Falta Amor to Exiliados En La Bahia.
 Being very similar to The Beatles’ "Love", the intent of the mashup album was to bring to the fans and audience a remix like no other, for the real fans to listen to Maná like they never have.
The Grey Album is a mashup album by Danger Mouse, released in 2004.
 It mixes an a cappella version of rapper Jay-Z's "The Black Album" with samples from The Beatles' LP "The Beatles", commonly known as "The White 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.
Mouth Sounds is a mashup album by American musician Neil Cicierega.
 The album was released independently by Cicierega on April 27, 2014.
 Consisting of mashups pairing Top 40 hits of the 1980s and 1990s along with Smash Mouth's "All Star", "Mouth Sounds" received positive reviews from music critics.
 It received a second installment, "Mouth Silence", months later, which followed the same mashup format, and a third installment in "Mouth Moods" in 2017.
Mouth Moods is the third mashup album by American musician and comedian Neil Cicierega, released on 23 January 2017.
 Like his previous mashup albums "Mouth Sounds" and "Mouth Silence", its source material is primarily Top 40 hits from the late 20th and early 21st centuries.
 In addition to the return of samples from Smash Mouth "All Star", which were more carefully hidden in "Mouth Silence", the song "One Week" by Barenaked Ladies appears as a recurring element of the album.
iPunx is a mashup duo from London in the United Kingdom who has released several EPs and one internet-only mashup album.
 They are known for an eclectic mixture of styles, mixing house, rock, hiphop, punk and electro.
Incorporated is a mashup album made by the mashup band The Legion of Doom.
the notorious xx is a mashup project that pairs the music of Notorious B.I.G. with the debut album of The xx, [[xx (album)25, 2010 and at a San Francisco listening party.
 Since its release, the album received one million downloads, press from thousands of blogs and magazines, including "New York Magazine" and LA Weekly, and "[[The Guardian]]" called it "the best mashup album of 2010".
Pet Sounds in the Key of Dee is a mashup album by United Kingdom-based record producer Bullion, released for free online download in June 2007.
 It is a tribute to American rapper J Dilla and the album "Pet Sounds" (1966), originally recorded by the Beach Boys.
 It is described by the online publication Gorilla vs. Bear as a "more adventurous version of "The Grey Album", but with J Dilla and the Beach Boys standing in for Jay-Z and the Beatles".