Question: Which recording artist released its fourth studio album, titled Ether, which featured a guest appearance from singer, songwriter and rapper CeeLo Green?
Context: Heart Blanche is the fifth studio album by American recording artist CeeLo Green.  The album was released on November 6, 2015, by Atlantic Records. Something Else is the thirteenth studio album by American rapper Tech N9ne.  It was released on July 30, 2013, by Strange Music and RBC Records.  The album has broken up into three portions – Earth, Water & Fire.  Production on the album was handled during 2012 to 2013, primarily by frequent collaborator Seven, among others such as Young Fyre, Drumma Boy, and Fredwreck.  The album features guest appearances from B.o.B, Big K.R.I.T., CeeLo Green, The Doors, The Game, Kendrick Lamar, Serj Tankian, T-Pain, Trae tha Truth and Wiz Khalifa, among others including several artists from Tech N9ne's Strange Music imprint. "Fuck You" (stylized as "Fuck You!"  or "F**k You!") , also titled "Forget You" or "FU" for the clean versions, is a song by American recording artist CeeLo Green.  It was written as a collaboration between Green, Bruno Mars, The Smeezingtons, and and produced by The Smeezingtons.  It was released on August 19, 2010 as the first single from Green's third studio album, "The Lady Killer" (2010).  "Fuck You" received positive reviews from music critics, and was an international commercial success, making the top-10 in thirteen countries, including topping charts in the United Kingdom, and number two on the "Billboard" Hot 100. "Only You" is a song by American recording artist CeeLo Green, released by Atlantic Records in January 2013.  The song, which features guest vocals from American singer Lauriana Mae, was co-written by Green alongside fellow American singer-songwriter, Skylar Grey.  On April 17, 2013, Green and Mae performed "Only You" on "The Ellen DeGeneres Show". Thomas DeCarlo Callaway (born May 30, 1975), better known by his stage name CeeLo Green (sometimes rendered as Cee Lo Green), is an American singer, songwriter, rapper, record producer and actor. Burning Bridges is the first extended play (EP) by American hip hop recording artist Ludacris.  It was released through the iTunes Store on December 15, 2015.  "Burning Bridges" features guest appearances from Rick Ross, CeeLo Green, John Legend, Jason Aldean and Miguel. Ether is the fourth studio album by American hip hop recording artist B.o.B.  Issued on May 12, 2017, by Label No Genre, Grand Hustle Records and Empire Distribution, it is the first album by B.o.B to be released independently.  The album is the fifth installment in his "Element" series going back to 2015, with the previous four compiled on 2016's "Elements".  The album features guest appearances from Lil Wayne, Young Thug, T.I., Big K.R.I.T., Ty Dolla Sign, Usher, CeeLo Green, Young Dro, and more. "I Know" is a song by American hip hop recording artist Yo Gotti.  The song was released on November 15, 2013, as the fourth single from his fourth studio album, "I Am" (2013).  "I Know" features a guest appearance from rapper Rich Homie Quan who produced the song along with Trauma Tone.  The song samples Club Nouveau's "Why You Treat Me So Bad", the same song sampled on Luniz's prolific "I Got 5 On It".  Following its release, the song peaked at number 31 on the US "Billboard" Hot R&B/Hip-Hop Songs chart. Trouble Man: Heavy Is the Head is the eighth studio album by American hip hop recording artist T.I..  It was released on December 18, 2012, by Grand Hustle Records and Atlantic Records.  The production has provided by some of T.I.'s longtime collaborators; including DJ Toomp, Jazze Pha, Pharrell Williams and Lil' C.  These high-profile record producers such as T-Minus, Cardiak, No I.D., Rico Love, Planet VI, Tommy Brown and Chuck Diesel, also contributed to the album.  The album features guest appearances from P!nk, Lil Wayne, André 3000, R. Kelly, Akon, Meek Mill, CeeLo Green, ASAP Rocky, Trae tha Truth, Victoria Monet and Grand Hustle's own D.O.P.E. "Drop the World" is a song by American rapper and recording artist Lil Wayne, featuring a guest appearance from fellow American rapper Eminem.  It serves as the third single from Lil Wayne's seventh studio album, "Rebirth" (2010).  This song is also titled as: Eminem x Lil Wayne - "Drop the World" on Eminem's hidden video album titled "Detroit King" The song was released on iTunes on December 28, 2009.  Lil Wayne, Eminem, and Travis Barker of Blink-182 performed the song together along with Drake's song "Forever" at the 52nd Grammy Awards in 2010.  On April 10, 2014, the single was certified quadruple platinum by the RIAA.
Answer: B.o.B.