Lee Seung-hyun (Hangul: 이승현; born December 12, 1990), better known by his stage name Seungri (Hangul: 승리, "Victory") and V.I when performing in Japan, is a South Korean singer, songwriter, record producer, actor, and entrepreneur.
 In the mid-2000s, Seungri rose to prominence as one of three vocalists and youngest member of the South Korean boy band Big Bang under YG Entertainment, which eventually became one of the best-selling digital group of all-time in Asia and one of the best-selling boy bands in the world.
 With the release of the group's second studio album "Remember" (2008), in which the second single released, "Strong Baby", was performed solely by Seungri, he began to adopt a more mature image as an artist.
Kesha Rose Sebert ( ; born March 1, 1987; formerly stylized as Ke$ha) is an American singer, songwriter and rapper.
 In 2005, at age 18, Kesha was signed to producer Dr. Luke's label Kemosabe Records.
 Her breakthrough came in early 2009 after appearing on American rapper Flo Rida's number-one single "Right Round".
 Kesha's music and image propelled her to immediate success, with her debut album "Animal" premiering at the top of the charts in several countries.
 She achieved 3 more number-one singles, "Tik Tok" and "We R Who We R" as a solo artist, and "Timber" as a featured artist.
 At the same time, she continued to write songs for other artists, becoming respected as a songwriter. "
Warrior", her second studio album, was released in 2012, and spawned her eighth consecutive top-ten single "Die Young".
 "Tik Tok", at one point, was the best-selling digital single in history, selling over 14 million units internationally.
The Midnight Beast, sometimes abbreviated as TMB, is a British comedy/parody music group from London.
 They are most famous for their YouTube cover-parody of the 2009 single "TiK ToK" by American pop artist Ke$ha.
 The group currently has three members: Stefan Abingdon, Dru Wakely and Ashley Horne.
"Praying" is a song recorded by American singer Kesha for her third studio album, "Rainbow" (2017).
 It was made available for digital download by Kemosabe Records on July 6, 2017 as the record's lead single.
 Kesha wrote "Praying" with Ben Abraham, Andrew Joslyn, and the song's producer, Ryan Lewis.
 The song is a gospel and soul-influenced pop piano ballad that features violins and drums in its instrumentation.
 It was written to showcase Kesha's vocal range and to represent her as a person.
 According to Kesha, "Praying" is about "hoping everyone, even someone who hurt you, can heal".
 Reviewers suggested that the recording is about Dr. Luke, whom Kesha accused of sexual assault and emotional abuse.
Margaret is a Polish singer-songwriter.
 She rose to prominence after the release of her debut single, "Thank You Very Much" (2013), which charted in the top fifty in Austria, Germany and Italy, and was the third best-selling digital single of 2013 in Poland released by a Polish artist.
 The song was later included on singer's first EP "All I Need", which was released in July 2013 and peaked at number fifty in Poland.
The Digital Songs chart (previously named Hot Digital Songs) ranks the best-selling digital songs in the United States, as compiled by Nielsen SoundScan and published by "Billboard".
 It debuted in the issue dated January 22, 2005, and merged all versions of a song sold from digital music distributors.
 Its data was incorporated in the Hot 100 three weeks later.
 Since October 2004, digital sales have been incorporated into many of "Billboard"' s music singles charts.
 The decision was based on the dramatic increase of the digital market while commercial single sales in a physical format were becoming negligible.
Shtick Heads is the second album released by British comedy band The Midnight Beast.
 The album and its artwork were announced in January 2014 on the band's website, followed by the track listing the next day.
 The album was released via CD and digital download.
The Midnight Beast is the self-titled debut album from the UK comedy band The Midnight Beast.
 It was released after the band's sitcom "The Midnight Beast" aired in 2012.
 The album was released on CD and to digital music retailers.
"Your Love Is My Drug" is a song by American singer-songwriter Kesha, taken from her debut studio album, "Animal" (2010).
 It was released as the album's third single on May 14, 2010.
 The song was written by Kesha and Pebe Sebert, with Ammo, who co-produced the song with Dr. Luke and Benny Blanco.
 "Your Love Is My Drug"'s initial writing took place during a plane ride.
 Described by Kesha as a "pretty happy" song with dark undertones, the song's inspiration came from Kesha's relationship with an ex-boyfriend.
 Written about the couple's codependency, the song compares their love for one another to a drug.
American singer Kesha made her international debut in early 2009 featuring on the Flo Rida single, "Right Round", which reached number one in the United States on the "Billboard" Hot 100 and topped the charts in five other countries.
 Kesha's debut album, "Animal", released in January 2010, topped the Canadian and American charts, debuting at number one in its first week on the "Billboard" 200.
 The album's lead single, and Kesha's solo debut single, "Tik Tok", was released in August 2009 and reached number one in eleven countries and spent nine consecutive weeks on top of the "Billboard" Hot 100.
 Since its release in 2009, the song has sold 15 million copies worldwide, therefore making it the best-selling digital single of all time.
 The album spawned three more hit singles, "Blah Blah Blah", "Your Love Is My Drug" and "Take It Off".
 She topped eight charts on the 2010 "Billboard" Year-End Chart, including Top New Artists, Hot 100 Songs and Hot 100 Artists.

Question: What is the Kesha song that was at one point the best-selling digital single in history and parodied by the group The Midnight Beast?
Answer: Tik Tok