Question: Sia recorded a song "the greatest" that went in her seventh studio album called what?

Context articles: The Ugly World Tour 2011
Alive (Sia song)
Wolves (Kanye West song)
This Is Acting
The Greatest (Sia song)
Lady Croissant
Reaper (song)
Unstoppable (Sia song)
Cheap Thrills (song)
Invincible (Kelly Clarkson song)

The Ugly World Tour 2011 is a concert tour by Children of Bodom in support of their seventh studio album, "Relentless Reckless Forever".
 The name of the tour comes from a song from the new album called Ugly.
"Alive" is the lead single from Australian singer and songwriter Sia's seventh studio album "This Is Acting" (2016).
 It was co-written by Sia, Adele, and Tobias Jesso Jr. The song was produced by Jesse Shatkin.
 "Alive" was released on 25 September 2015.
 The song was originally intended for Adele's third studio album, "25", along with "Bird Set Free".
 However, since Adele decided not to use the songs, she let Sia use them for her seventh studio album.
 Musically, it is a midtempo pop and synth-pop song.
"Wolves" is a song by American rapper Kanye West, featuring vocals Sia and Vic Mensa from his seventh studio album "The Life of Pablo" (2016).
 It was produced by Cashmere Cat and Sinjin Hawke and was originally planned to be the opening track to his seventh studio album, "The Life of Pablo".
 West debuted the song on February 12, 2015 at a fashion show where he also premiered his new Adidas shoe.
 The presentation was broadcast live to more than 40 locations around the world.
This Is Acting is the seventh studio album by Australian singer and songwriter Sia.
 It was released on 29 January 2016 by Inertia, Monkey Puzzle and RCA Records.
 The album is mostly composed of songs written by Sia for other pop artists that were not included on their albums.
 Sia described songwriting for others as "play-acting," hence the title "This Is Acting".
"The Greatest" is a song recorded by Australian recording artist Sia for the deluxe edition of her seventh studio album, "This Is Acting" (2016).
 Being made available for digital consumption as the record's third single on 5 September 2016 through Monkey Puzzle and RCA Records, "The Greatest" features the vocal collaboration of American rapper Kendrick Lamar.
 The electropop and tropical house song was written by Sia, Greg Kurstin, and Lamar while production was solely handled by Kurstin.
 The solo version was written solely by the former two.
Lady Croissant is a live album by Australian singer Sia, released in April 2007 through the record label Astralwerks.
 Called a "mini-album" by Astralwerks, the collection contains one studio recording ("Pictures") as well as eight live tracks recorded during an April 2006 concert at the Bowery Ballroom in New York City.
 Eight songs were written or co-written by Sia; also featured is a cover version of Ray Davies' song "I Go to Sleep", a studio recording of which later appeared on Sia's studio album "Some People Have Real Problems" (2008).
 The album was produced by Dan Carey, mixed by Jon Lemon and Taz Mattar at Sarm Studios in London, and mastered by Emily Lazar and Sarah Register at The Lodge in New York City.
 "Lady Croissant" received a mixed critical reception and spawned one single, "Pictures", which was released exclusively via American Eagle Outfitters on 27 November 2006.
"Reaper" is a song from Australian singer and songwriter Sia's seventh studio album "This Is Acting" (2016).
 The song was co-written by Sia, Kanye West, Noah Goldstein, Charles Misodi Njapa (better known by his stage name 88-Keys), and Dom $olo, originally for Rihanna's album "Anti" (2016).
 "Reaper" was co-produced by West, Dom $olo, Goldstein, 88-Keys, Jesse Shatkin, and Jake Sinclair.
 Sia and West had previously collaborated on the latter's song "Wolves".
"Unstoppable" is a song by Australian singer-songwriter Sia Furler (often referred to mononymously as Sia), taken from her seventh studio album "This Is Acting" (2016).
 The song was written by Sia and Christopher Braide, and produced by Jesse Shatkin.
 It was released as the album's final promotional single on January 20, 2016.
 In July, a new version of the song was made for Gillette's 2016 Olympic ad campaign, "Pretty Isn't Perfect" which features a verse from Pusha T.
"Cheap Thrills" is a song recorded by Australian recording artist Sia for her seventh studio album, "This Is Acting" (2016).
 It was written by Sia and Greg Kurstin, while solely produced by Kurstin.
 An official remix version of "Cheap Thrills" features vocals by Jamaican performer Sean Paul and was made available for digital download on 11 February 2016 as the record's second single.
 This version was nominated for the Grammy Award for Best Pop Duo/Group Performance.
 The song is a "bouncy", "reggae-tinged" synthpop song that incorporates "a constant tropical beat and electropop-style synth layers".
 Paul added his own lyrics to the remix of the song.
"Invincible" is a song by American singer Kelly Clarkson from her seventh studio album, "Piece by Piece" (2015).
 It was written by Sia, Jesse Shatkin, Steve Mostyn, and Warren Felder.
 Produced by Shatkin, the track is an orchestral synthpop anthem about self-empowerment.
 "Invincible" features uncredited vocals from Sia, as well as string arrangements by Oliver Kraus.
 It was first released as the first promotional single from "Piece by Piece" on February 23, 2015, but then issued as the album's second single to Hot Adult Contemporary radio stations on May 18, 2015 through RCA Records.