Unconscious State is the debut studio album by American rapper Jon Connor.
 The album was released on July 2, 2013 by Connor's All Varsity Music.
 In early 2013, Jon Connor revealed that he was working on various projects including, his debut studio album "Unconscious State" along with his second studio album.
 The album featured guest appearances by Danny Brown, Chris Webby, Freddie Gibbs, Royce da 5'9", Talib Kweli, Willie the Kid and Smoke DZA among others.
 Production was handled by Connor himself, Mr. Porter, Brix and Optiks among others.
 Upon its release the album peaked at number 35 on the US "Billboard" Top R&B/Hip-Hop Albums and number seven on the "Billboard" Heatseekers Albums charts.
Flower Boy (alternatively titled Scum Fuck Flower Boy) is the fourth studio album by American rapper Tyler, The Creator.
 The album, which is his first under a major record label, was released on July 21, 2017, by Columbia Records.
 Although the album's production was handled entirely by Tyler, The Creator himself, it features guest vocals from a range of artists, including Frank Ocean, ASAP Rocky, Anna of the North, Lil Wayne, Kali Uchis, Steve Lacy, Estelle, Jaden Smith and Rex Orange County.
Danish singer-songwriter Oh Land has recorded material for four studio albums and guest features.
 She has also released an EP and a soundtrack album, and appeared as a featured artist for songs on other artists' releases.
 After solely writing and independently issuing "Fauna" in 2008 with Fake Diamond Records, Oh Land released her eponymous second studio album in 2011.
 "Oh Land" explored dance and modern pop music and featured contributions from a variety of producers.
 It peaked at number five on the Danish Albums Chart, and became certified platinum for sales of 20,000 copies in December 2012.
 "Oh Land" additionally peaked at number 184 on the United States' "Billboard" 200, becoming her first and only album to do so.
 Five singles were released from the effort, with three of them ("Sun of a Gun", "White Nights", and "Speak Out Now") peaking within the top forty of the single charts in Denmark; "Sun of a Gun" also landed the number twelve spot on "Billboard"' s Dance Club Songs chart.
 Oh Land's "otherworldy vocals" and "lush soundscapes" on the album drew comparisons to the music of Björk, La Roux, and Lykke Li.
 She was featured three times on Danish rock band Kashmir's sixth studio album "Trespassers" (2010), on "Bewildering in the City", "Mouthful of Wasps", and "Pallas Athena".
 In 2011, Oh Land contributed guest vocals to "Life Goes On", a promotional single for "The Papercut Chronicles II" (2011) by Gym Class Heroes.
Ravenface are a British metalcore band, originating from Blackpool in Lancashire, formed in 2008.
 They released their self-titled EP in 2009, which was followed by their debut studio album "This Is Annihilation" the following year on November 30.
 The band performed at Hammerfest III on March 18, 2011 in Prestatyn, performing on the Fresh Blood Stage.
 Their second studio album titled "Divided Kingdom" was released in 2012.
 It featured guest vocals by Mutiny Within's Chris Clancy on the eponymous track.
Anna Lotterud (born 8 June 1989), better known by her stage name Anna of the North, is an Oslo-based Norwegian singer-songwriter from Gjøvik.
 Her music has been regarded as "soft, soul-bearing electro-pop".
My Way is the seventh studio album by Jamaican recording artist Lady Saw.
 The album featured guest artists such as Eve, Camar Doyles, & Ding Dong.
 A duet with Ali Campbell on "I Do Love You" was recorded for the album, but not included on the final track listing.
No Boys Allowed is the second studio album by American recording artist Keri Hilson.
 It was released on December 17, 2010, by Mosley Music and Zone 4 Records.
 On the album, Hilson has reunited with Timbaland and Polow da Don, who executively produced the album, as they did with her debut release.
 Hilson also worked with several other producers and songwriters, including Ne-Yo, John Legend, StarGate, Bei Maejor and Boi-1da, among others.
 Meanwhile, Chris Brown, Rick Ross, Kanye West, J. Cole, Nelly and Timbaland, are serving as featured guest vocals.
 Musically, "No Boys Allowed" is an R&B album, which incorporates elements of pop, soul, electro and dancehall into various songs.
Lucky Day is the sixth studio album released by Jamaican singer Shaggy.
 The album was released on October 29, 2002.
 The album peaked at number 24 on the "Billboard" 200 and later reached Gold certification.
 Three singles were released from the album: "Hey Sexy Lady", "Strength of a Woman" and "Get My Party On".
 The album featured guest appearances from Shaggy's longtime collaborators Brian and Tony Gold, as well as a guest appearance from Chaka Khan.
 The song "We Are the Ones" was included on the album "Barbie Mix" which was released to promote the My Scene dolls.
Lost Souls Like Us is Benjy Davis Project's fourth studio album, released on March 2, 2010.
 It was recorded at Rivergate Studios in Hendersonville, TN.
 The album featured the current band line-up of Benjy Davis and Mic Capdevielle.
 In addition to Davis and Capdevielle, the album featured a cast of seasoned studio musicians: Mark "Sparky" Matejka of Lynyrd Skynyrd, Danny Chauncey of .38 Special and Jason "Slim" Gambill of Lady Antebellum all contributed guitar parts; Ethan Pilzer (Jewel, Big & Rich) played bass; Jason Spiewak and Bobby Capps played piano and organ; and Sara Jean Kelley sang background vocals.
Eli is the fourth studio album by the Serbian alternative rock band Supernaut, released by Automatik Records in 2006.
 The album, for which the cover was designed by Srđan Marković "Đile", was elected the fifth best album of the year 2006 on the webzine Popboks annual list.
 The album featured guest appearance by former Profili Profili and Laibach drummer Dragoslav Radojković "Draža".

Question: Which artist's fourth studio album featured guest vocals from Anna Lotterud?
Answer: Tyler, The Creator