Girls' Generation-TTS (, also known as TTS, TaeTiSeo, or Girls' Generation-TaeTiSeo) is the first sub-unit of South Korean girl group Girls' Generation, formed by SM Entertainment in 2012. It is composed of three Girls' Generation members: Taeyeon, Tiffany, and Seohyun. The sub-group has released three extended plays: Twinkle, Holler, and Dear Santa.

History During the year 2012, South Korean girl group Girls' Generation went through an unannounced hiatus as the majority of the group's members were focusing on individual activities. Some acted in television dramas while others participated in various television programs. The subgroup TTS was born because members Taeyeon, Tiffany, and Seohyun wanted to carry on with their music activities. All three were hosts of the weekly music program Show! Music Core at the time. On April 19, 2012, SM Entertainment officially announced the formation of the subgroup and hinted at the possibility of other future subgroups, explaining, "the members of the unit [are rotated] according to the [unique] music and concept of each new subgroup album."Subgroup "TTS", formed by Girls' Generation's Taeyeon, Tiffany & Seohyun, debuts in May (in Korean) Daum.net (April 19, 2012). Retrieved on April 20, 2012. Compared to Girls' Generation, TTS's main focus is on each member's vocal ability while the original group places more emphasis on the overall songs and uniform group performances. The name "TaeTiSeo" or "TTS", is made up of the first syllables of Taeyeon, Tiffany, and Seohyun.

Their debut EP, Twinkle, was released on April 30, 2012. It was the first album by a Korean artist to rank number 1 on the Billboard World Albums chart. At the time, it was also the highest charting K-pop album on the Billboard 200, reaching number 126. The title track of the same name sold 2,520,485 digital copies in South Korea as of July 2014, and the album has sold 155,521 copies in South Korea.Cumulative sales for "Twinkle": TTS became the first subgroup to achieve a "triple crown" on South Korean music shows, reigning in the number 1 spot for three weeks in a row.

In September 2014, the group released their second EP, Holler, selling 87,513 copies.Cumulative sales for "Holler": The album debuted at number 1 on South Korea's Gaon Album Chart and the Billboard World Albums chart. With this achievement, TTS become the third Korean artist, and the first female artist, to have more than one number 1 on the Billboard World Albums chart. During an interview with Billboard, the three singers shared, "This album was really personal for us and it was fun... to put out a much more raw side of our music... the music we put together has so much more layers, so much more depth to it in terms of sound, choruses or harmonizing together... Our main goal was to not be visually entertaining, but be vocally entertaining." They also revealed that Seohyun wrote the lyrics to one of the songs, "Only U", while Tiffany served as the visual director to the concept of "Holler" music video. During promotions, the three singers were featured in the reality show The TaeTiSeo. The show took on the personal side of Taeyeon, Tiffany and Seohyun, revealing how they live their normal everyday lives and what they do in their free time. Some footage of the album preparation was also shown.

In December 2015, TTS released their third EP, a Christmas special album titled Dear Santa. The album debuted at number 2 on South Korea's Gaon Albums Chart and has sold at least 60,456 copies to date. Seohyun wrote the lyrics to the title track "Dear Santa". As an effort to support music education for children in Asia, TTS contributed a part of the album's sales profits to a charity called "SMile for U", a campaign held between SM Entertainment and UNICEF.

Discography Extended plays TitleAlbum detailsPeak chart positionsSalesKORPeak chart positions for EPs on the Gaon Album Chart: Twinkle: Holler: Dear Santa: JPNPeak chart positions for EPs on the Oricon Albums Chart: Twinkle: Holler: Dear Santa: USUSWorldPeak chart positions for EPs on the World Albums Chart:USHeat.Peak chart positions for EPs on the Heatseekers Albums Chart: Twinkle Released: April 29, 2012 Label: SM Entertainment Formats: CD, digital download 1 6 126 1 2KOR: 164,621 JPN: 27,768 US: 3,000 Holler Released: September 16, 2014 Label: SM Entertainment Formats: CD, digital download 1 23 — 1 11KOR: 97,969 JPN: 12,758 Dear Santa Released: December 4, 2015 Label: SM Entertainment Formats: CD, digital download 2 25 — 4 14KOR: 65,894 JPN: 7,845 "—" denotes releases that did not chart or were not released in that region.

Singles TitleYearPeak chart positionsSalesAlbumKORPeak chart positions on the Gaon Digital Chart: KORHotPeak chart positions on the Korea K-Pop Hot 100: USWorldPeak chart positions on the World Digital Songs:

"Twinkle" 2012 1 2 4KOR: 2,528,880 Twinkle"Whisper" 2014 4 — —KOR: 346,386Cumulative sales for "Whisper": Holler"Holler" 3 — 6KOR: 466,694Cumulative sales for "Holler":"Dear Santa" 2015 7 — 7KOR: 486,713Cumulative sales for "Dear Santa": Dear Santa "—" denotes songs that did not chart.

Other charted songs TitleYearPeak chart positionsAlbumKORGaon chart positions for songs:KORHotK-Pop Hot 100 chart positions for songs: Note: the full chart can be viewed with subscription at Billboard.com/biz "Baby Steps"2012 15 22Twinkle"OMG (Oh My God)" 26 44"Library" 33 75"Goodbye, Hello" 32 59"Love Sick" 28 58"Checkmate" 44 89"Adrenaline" 2014 42 —Holler"Only U" 51 —"Stay" 69 —"Eyes" 75 —"Merry Christmas"2015 29 —Dear Santa"Winter Story" 41 —"First Snow" 51 —"I Like the Way" 57 — "—" denotes songs that did not chart.

Filmography Television Year Title Note 2014 The TaeTiSeo Reality show

Music videos Title Year Director"Twinkle" 2012"OMG (Oh My God)""Holler" 2014Hong Won-ki"Dear Santa" 2015"Dear Santa" (English )

Awards and nominations

+ Name of the award ceremony, year presented, category, nominee of the award, and the result of the nomination Award ceremony Year Category Nominee / Work Result Gaon Chart K-Pop Awards 2013 Album of the Year – 2nd Quarter Twinkle Song of the Year – May "Twinkle" Golden Disc Awards2013 Disk Daesang Twinkle 2013 Golden Disk Awards: Digital Daesang Popularity Award Girls' Generation-TTS 2015 Disk Bonsang Holler Disk Daesang Melon Music Awards 2012 Top 10 Artist "Twinkle" Mnet 20's Choice Awards 2012 20's Trendy Music Girls' Generation-TTS Mnet Asian Music Awards2012 Best Female Group Best Global Group Artist of the Year 2014 Youku-Tudou Best Music Video "Holler" 2014 Mnet Asian Music Awards: K-Pop Fan's Choice – Female Girls' Generation-TTS SBS MTV Best of the Best 2012 Best Global Artist of the Year 2014 Best Female Video "Holler" Seoul Music Awards 2013 Bonsang Award "Twinkle" Popularity Award 2015 Bonsang Award Holler Daesang Award Style Icon Awards 2014 Top 10 Style Icons Girls' Generation-TTS

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