"Turn Around (5, 4, 3, 2, 1)" is a song by American rapper Flo Rida from his third studio album, "Only One Flo (Part 1)".
 It was released as the second single on 8 November 2010 in the United States.
 The song contains samples of "Din Daa Daa" by German dance singer George Kranz, and "Oh Yeah" by Swiss electronica band Yello.
 It debuted at number 98 on the "Billboard" Hot 100 and was featured prominently in the closing credits of "The Hangover Part II".
 It was the second such use of a Flo Rida song in the closing credits of a film from "The Hangover" franchise—the first was "Right Round", which also featured DJ Frank E and was used in the closing credits of "The Hangover".
Oh Yeah is a music centre located in Belfast, Northern Ireland, in the Cathedral Quarter.
 It was founded primarily to support young talented musicians and bands from Northern Ireland and its huge and growing music scene by providing help and promotion, technical equipment for rehearsing, recording, gigs and event organisation, performing space and releases of band compilations ("Oh Yeah Sessions").
 The Oh Yeah music centre's genres are varying in its manifoldness of Alternative rock, Indie rock, Electronica, Post rock, Post punk, Crossover, Experimental rock and further musical stylistic ways and conceptions.
"Who Dat Girl" is a song by American rapper Flo Rida.
 It features American singer Akon.
 The song was written by Flo Rida, Dr. Luke, Claude Kelly, Benny Blanco, Bruno Mars, and Philip Lawrence, and it was produced by Dr. Luke and Benny Blanco.
 It was released on January 11, 2011 as the third single from Flo Rida's third studio album, "Only One Flo (Part 1)".
 It peaked at number twenty-nine on the "Billboard" Hot 100.
"G.D.F.R." (abbreviation for Goin' Down for Real) is a song by American rappers Flo Rida and Sage the Gemini from Flo Rida's 2015 EP "My House".
 It was released as the album's lead single on August 21, 2014 in the United States.
 The song was written by Flo Rida, Sage the Gemini and P-Lo and produced by DJ Frank E and Andrew Cedar, with co-production from Lookas and Miles Beard.
Yello is a Swiss electronic band consisting of Dieter Meier and Boris Blank.
Kuromajo-san ga Tōru!!
 is an anime television series by Shin-Ei Animation based on the series of children's novels written by Hiroshi Ishizaki and illustrated by Kaori Fujita.
 The series follows Chiyoko "Choco" Kurotori, a girl who inadvertently summons a black witch named Gyubid and ends up becoming her magical apprentice.
 The series began airing on NHK Educational TV from April 4, 2012.
 The opening theme is "Doki Doki Shichau no Oh Yeah!
 (Doki Doki しちゃうの Oh yeah!
 , A Heart Pounding Situation's Oh Yeah! )
 by Ayumu Shinga.
"Oh Yeah", also known as "Oh Yeah (There's a Band Playing On the Radio)" or "Oh Yeah (On the Radio)" on certain releases, is a hit single by the English rock band Roxy Music.
 It was taken from their 1980 album "Flesh and Blood".
"Sugar" is a song by American rapper Flo Rida, featuring American pop/dance singer Wynter Gordon.
 The song's chorus samples the song "Blue (Da Ba Dee)" by Italian electronic music group Eiffel 65.
 The song was written by Flo Rida, The Jackie Boyz, Jeffrey Jey, Maurizio Lobina, and Massimo Gabutti, and was produced by DJ Montay for Flo Rida's second album, "R.O.O.T.S.".
 The song was released as the album's third official single in March 2009 as a digital download.
"Sweet Spot" is a song recorded by American rapper Flo Rida for his fourth studio album "Wild Ones" (2012).
 It features guest vocals from American singer Jennifer Lopez.
 The song was written by Flo Rida, Raphael Judrin, Pierre-Antoine Melki, Breyan Issac and Julie Frost.
 "Sweet Spot" was produced by SoFly and Nius; Jacob Luttrell produced Flo Rida's vocals for the song, while Kuk Harrell produced Lopez's.
"Change Your Life" is a song by American group Far East Movement from their fourth studio album "Dirty Bass".
 It features American rapper and singer-songwriter Flo Rida and Dutch DJ Sidney Samson.
 The song was released in Belgium on October 26, 2012 as the album's fourth single.
 The song was written by Far East Movement, Flo Rida, Sidney Samson, Nathan Walker, Breyan Isaac, Antonio Mobley, and produced by Sidney Samson.
 Flo Rida's verse borrows lyrics from the 1989 Lisa Stansfield hit "All Around the World", which was written by Stansfield and producers Ian Devaney and Andy Morris.
 It has peaked to number 91 in Germany.

Question: Who sings "Oh Yeah" which is sampled in Flo Rida's song Turn Around?
Answer: Yello