Question:  "ATLiens" is a song by a hip-hop group formed in which year ?

Context paragraphs:
Self Taught: Self Taught is a Canadian hip-hop group formed in 2002 in Vancouver.  Its three members, which are all producers/emcees, consists of Cliff Herman, Vintage and Jay Robillard.  The group is known for embracing the Self Taught mantra by producing all their beats, mixing and mastering their albums and producing their own videos.  The group has released three albums, "Arrival", in the summer of 2007, "5 Year Journey" in 2012 and "Feast of Fools" in 2013.

Lucky J: Lucky J (Hangul; 럭키제이; RR: "leogkijei") was a South Korean hip-hop group formed by YMC Entertainment.  The group's three original members were J'Kyun, Jessi, and J-Yo.  The group debuted with their first single "Can You Hear Me?"  in July 2014.

W 63 minuty dookoła świata: W 63 minuty dookoła świata (Polish: "Around the world in 63 minutes") is the second studio album by Polish hip-hop group Kaliber 44 released March 2, 1998 on S.P. Records.  On November 25, 1998 the album went gold according to ZPAV.  In Poland the album got the Fryderyk award for best hip-hop album of the year.  The hip-hop group members include Joka and Abradab, Magik and DJ Feel X.

Tru 2 da Game: Tru 2 da Game is the fourth studio album released by New Orleans hip-hop group, TRU.  It was released February 18, 1997 on No Limit Records and was produced by Beats By the Pound .  The album found a large amount of success, peaking at #8 on the "Billboard" 200 and #2 on the Top R&B/Hip-Hop Albums.  A single from the album enititled "I Always Feel Like..." also found some success, peaking at #71 on the "Billboard" Hot 100, #11 on the Hot Rap Singles and #42 on the Hot R&B/Hip-Hop Singles & Tracks.  The same year the album was re-released with the song "Smoking Green" removed.  The re-released version included three new songs, a remixed version of "FEDz", a C-Murder solo song "Eyes Of A Killa" and a Silkk The Shocker solo song "Pimp Shit."  "FEDz" samples Aaliyah's hit single "If Your Girl Only Knew".  The album was certified 2x Platinum by the RIAA, on October 2, 1997, and remains the group's most successful album.

Raspberry Cordial: Raspberry Cordial were an Australian hip-hop group formed in 1991 by Chris Lumsden on keyboards and John Safran on lead vocals.  George Weinberg played drums on the first rehearsal, but was quickly replaced with a drum machine.  When the duo formed Safran was in Year 12 at Yeshivah College, an orthodox Jewish high school; while Lumsden was his friend.

ATLiens (song): "ATLiens" is the second single from hip-hop group Outkast's second studio album of the same name.  It is a double A-Side single, alongside a further track from the album, "Wheelz of Steel".  Both songs were written and produced by OutKast.  The song appeared on the FOX series "New York Undercover".  The single peaked at #35 on the "Billboard" Hot 100.

Rock da most: Rock Da Most is a German-based hip-hop group in Berlin.  The group is composed of members "DJ Derezone", "DJ Run X Kid", "MC Roskoe" and "MC Blacky".  Credited with releasing the first record by a West German hip-hop group, Rock Da Most released "Use the Posse" in 1988 prior to the reunification of West and East Germany.

Brothers Grym: Brothers Grym (also known as Ghetto Repaired Young Minds, or The Bee-Geez) was a New York hip-hop group formed by Too Poetic (born Anthony Berkeley on November 15, 1964 – died July 15, 2001) and his two younger brothers, lyricists Brainstorm (born Joel Berkeley in 1969) and R&B hip-hop producer E# (born Edward Berkeley in 1971, aka E Sharp, Goalfingaz).

Jazzy Belle: "Jazzy Belle" is the third and last single from hip-hop group Outkast's second studio album, "ATLiens".  It was released as a remix single and it peaked at #52 on the "Billboard" Hot 100.  The song is the only single from the album "ATLiens" to be produced by Organized Noize, the other two singles being produced by OutKast themselves.

Outkast: Outkast (stylized as OutKast) is an American hip hop duo formed in 1991, in East Point, Atlanta, Georgia, composed of Atlanta-based rappers André "André 3000" Benjamin (formerly known as Dré) and Antwan "Big Boi" Patton.  The duo achieved both critical acclaim and commercial success in the 1990s and early 2000s, helping to popularize Southern hip hop while developing distinctive personas and experimenting with diverse genres such as funk, psychedelia, techno, and gospel.

Supporting paragraphs: ATLiens (song) Outkast
Answer: 1991