Question: In what year was the singer who, along with Rick Ross, had a guest appearance in the extended play "Seven Days" born?

Context paragraphs:
Millions (song): "Millions" is a song by American hip hop recording artist Pusha T, which was originally released as a promotional single for his then-upcoming album "My Name Is My Name", on January 29, 2013.  It was later revealed that the song would not be featured on the album.  It was also included on his 2013 mixtape "Wrath of Caine".  The song, which features a guest appearance from fellow American rapper Rick Ross, peaked at number 47 on the "Billboard" Hot R&B/Hip-Hop Songs chart.

Rich Gang (album): Rich Gang is the first compilation album by Young Money and Cash Money as the supergroup Rich Gang.  The album was released July 23, 2013, by Young Money Entertainment, Cash Money Records and Republic Records.  The album contains contributions from several YMCMB members, including Birdman, Lil Wayne, Nicki Minaj, Tyga, Mack Maine, Limp Bizkit, Bow Wow, Ace Hood, Jae Millz, Cory Gunz, Gudda Gudda, Caskey, Detail, Busta Rhymes and Mystikal.  The compilation also features guest appearances from artists outside the labels, including Future, Meek Mill, French Montana, T.I., Yo Gotti, Flo Rida, Chris Brown, Rick Ross, The Game, Kendrick Lamar, and R. Kelly.  The album was supported by the three singles "Tapout" which peaked at No. 45 on the "Billboard" Hot 100, along with the R. Kelly featured "We Been On" and "50 Plates" by Rick Ross.  The album received generally mixed reviews from music critics and sold 40,000 copies in the US after three weeks of sale.

Burning Bridges (Ludacris EP): 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.

Halsey (singer): Ashley Nicolette Frangipane (born September 29, 1994), known professionally as Halsey ( ), is an American singer-songwriter.  Her stage name is a reference to the Halsey Street station of the New York City Subway in Brooklyn, and an anagram of her first name.  Gaining attention from self-released music on social media platforms, Frangipane was signed by Astralwerks in 2014.  She toured with acts such as The Kooks and Imagine Dragons to promote her debut extended play, "Room 93" (2014).  Her debut studio album, "Badlands" (2015), was certified platinum by the Recording Industry Association of America (RIAA).  Four singles were released from the album, all of which achieved minor commercial success.

So Sophisticated: "So Sophisticated" is a song by American rapper Rick Ross.  It was released on June 5, 2012 as the second single from his fifth studio album "God Forgives, I Don't" (2012).  The song, produced by The Beat Bully, features a guest appearance from fellow Maybach Music Group rapper Meek Mill.  On September 23, 2014, the single was certified Gold by the RIAA.

Nobody (Rick Ross song): "Nobody" is a song by American hip hop recording artist Rick Ross, taken from his sixth studio album "Mastermind" (2014).  The song, produced by Diddy, features a guest appearance by rapper French Montana.  It was written by William Roberts, Sean Combs, Karim Kharbouch, Christopher Wallace, Stevie Jordan, Ephrem Lopez and Jiv Poss.  On February 19, 2014, it was released as the album's third promotional single.  "Nobody" was met with generally positive reviews from music critics.  It debuted at number 38 on the US "Billboard" Hot R&B/Hip-Hop Songs upon the album's release.

Thug Cry: "Thug Cry" is a song by American hip hop recording artist Rick Ross, released on March 13, 2014 by Maybach, Slip-n-Slide, and Def Jam, as the 2nd and final official single from his sixth studio album "Mastermind" (2014).  The song was produced by J.U.S.T.I.C.E. League and features a guest appearance by American rapper Lil Wayne.  The song has since peaked at number 37 on the US "Billboard" Hot R&B/Hip-Hop Songs chart.  The sample comes from Heather by Billy Cobham (1974) and was used in 93 'til Infinity by Souls Of Mischief (1993) and in No Wheaties by Big K.R.I.T. (2012).

DJ Khaled discography: American musician DJ Khaled has released ten studio albums, twenty six singles and nine featured singles.  His first album, "Listennn... the Album", was released in 2006. " We the Best", his second album, was released in 2007 and contains the hits "We Takin' Over", with Akon, T.I., Rick Ross, Fat Joe, Birdman and Lil Wayne, and "I'm So Hood", with T-Pain, Rick Ross, Trick Daddy, and Plies.  The two songs peaked at number 28 and number 19 on the US "Billboard" Hot 100 and are platinum songs, and "We the Best" peaked at number eight on the US "Billboard" 200.  His next album, "We Global", from 2008, peaked at number seven on the albums chart and has the song "Out Here Grindin'", featuring Akon, Rick Ross, Plies, Lil Boosie, Ace Hood, and Trick Daddy. " All I Do is Win" had peaked at number 24 on the Hot 100 as "Victory"'s third single, and was certified double platinum by the RIAA.  Released in 2011 was "We the Best Forever", containing the top 10 song "I'm On One", with Drake, Rick Ross and Lil Wayne.  The album hit number five on the "Billboard" 200.

Curtain Call (Nina Sky song): "Curtain Call" is a song by the American hip-hop soul duo Nina Sky.  It was released as second single from their unreleased second studio album on August 12, 2008.  It features a guest appearance rapper Rick Ross.  In 2007, Nina Sky announced new album "The Musical" featuring Rick Ross.  The album was never released because of many issues with their record label Polo Grounds/J.  The second single from upcoming album was later announced to be "Curtain Call".  Although single was moderately successful, no music video was released.  Instead, duo filmed a music video for their following single "On Some Bullshit".

Seven Days (EP): Seven Days is the fourth extended play by Canadian recording artist PartyNextDoor.  It was released on September 28, 2017, by OVO Sound and Warner Bros.  Records.  The EP features two guest appearances from Halsey and Rick Ross.

Supporting paragraphs: Seven Days (EP) Halsey (singer)
Answer: 1994