Question: Sugarland's song Stay stayed right behind Taylor Swift's Our Song, which was driven by which instrument?

full_context: Document 1: Teardrops on My Guitar: "Teardrops on My Guitar" is a song by American singer-songwriter Taylor Swift. The song was co-written by Swift, alongside Liz Rose and produced by Nathan Chapman with Swift's aid. "Teardrops on My Guitar" was released on February 19, 2007 by Big Machine Records, as the second single from Swift's eponymous debut album (2006). The song was later included on the international release of Swift's second studio album, "Fearless" (2008), and released as the second pop single from the album in the United Kingdom. It was inspired by Swift's experience with Drew Hardwick, a classmate of hers for whom she had feelings. He was completely unaware and continually spoke about his girlfriend to Swift, something she pretended to be endeared by. Years afterwards, Hardwick appeared at Swift's house, but Swift rejected him. Musically, the track is soft and is primarily guided by a gentle acoustic guitar. Critics have queried the song's classification as country music, with those in agreement (such as Grady Smith of "Rolling Stone") citing the themes and narrative style as country-influenced and those opposed (such as Roger Holland of "PopMatters") indicating the pop music production and instrumentation lack traditional country elements.
Document 2: Taylor Swift (album): Taylor Swift is the debut studio album by American singer-songwriter Taylor Swift, released on October 24, 2006, by Big Machine Records. Swift was 16 years old at the time of the album's release and wrote its songs during her freshman year of high school. Swift has writing credits on all of the album's songs, including those co-written with Liz Rose. Swift experimented with several producers, ultimately choosing Nathan Chapman, who had produced her demo album. Musically, the album is country music styled, and lyrically it speaks of romantic relationships, a couple of which Swift wrote from observing relationships before being in one. Lyrics also touch on Swift's personal struggles in high school.
Document 3: Baby Girl (Sugarland song): "Baby Girl" is the debut single co-written and recorded by American country music group Sugarland. Originally released in 2003 as part of "Premium Quality Tunes", it was re-released in July 2004 as the first single from the album "Twice the Speed of Life". The single reached a peak position of number 2 on the "Billboard" Hot Country Singles & Tracks (now Hot Country Songs) charts in April 2005. The song spent a total of 46 weeks on the country music charts; setting a new record for the longest chart run since the inception of Nielsen SoundScan digital chart tabulation in 1990. In addition, "Baby Girl" became the highest-peaking debut single for a country music group in 14 years. It was written by group members Jennifer Nettles, Kristian Bush, and Kristen Hall, along with Troy Bieser.
Document 4: Our Song (Taylor Swift song): "Our Song" is a country song performed by American singer-songwriter Taylor Swift. The song was written by Swift and produced by Nathan Chapman. It was released on September 9, 2007 by Big Machine Records as the third single from Swift's eponymous debut album, "Taylor Swift" (2006). Swift solely composed "Our Song" for the talent show of her freshman year in high school, about a boyfriend who she did not have a song with. It was included on "Taylor Swift" as she recalled its popularity with her classmates. The uptempo track is musically driven mainly by banjo and lyrically describes a young couple who use the events in their lives in place of a regular song.
Document 5: Stay (David Guetta song): "Stay" is a house song performed by French DJ David Guetta, featuring vocals from singer Chris Willis. The track was released as the second single from Guetta's second studio album, "Guetta Blaster" on September 13, 2004. The single was not released in the United Kingdom. In certain territories, the single was released as a double A-side with the French only single "Money". A music video for the track exists, but it does not feature either Guetta or Willis. The single found the most success on the Belgian Singles Chart, peaking at #10.
Document 6: Stay (Rihanna song): "Stay" is a song recorded by Barbadian singer Rihanna for her seventh studio album, "Unapologetic" (2012). It features guest vocals by Mikky Ekko, and was released as the second single from the album on January 7, 2013. "Stay" was co-written by Ekko and Justin Parker. The song's lyrical content speaks of temptation and the inability to resist true love. Music critics were generally positive in their opinion regarding the balladry, with most describing it as a standout track on the album, though a few labeled it as boring. The song was featured on the third-season finale of the TV Show Younger.
Document 7: Stay (Kygo song): "Stay" is a song by Norwegian DJ and record producer Kygo, featuring American singer Maty Noyes. The song was produced by Kygo with fellow Norwegian, William Wiik Larsen, who also wrote it with Noyes. It was released as the fourth single from Kygo's debut studio album, "Cloud Nine" (2016). An official music video for the song was released on 18 February 2016.
Document 8: Stay (Sugarland song): "Stay" is a song recorded by American country music duo Sugarland. It was released in September 2007 as the fourth and final single from their album "Enjoy the Ride" (see 2006 in country music). Overall, the song is the group's eighth single to enter the "Billboard" Hot Country Songs charts, where it reached a peak position of #2 for four weeks, stuck behind Taylor Swift's "Our Song", and has become their signature song. The music video for "Stay" was ranked #10 on CMT's 100 Greatest Videos.
Document 9: Tim McGraw (song): "Tim McGraw" is the debut single and first published song recorded by American singer-songwriter Taylor Swift. The song was written by Swift and Liz Rose, and produced by Nathan Chapman. It was released on June 19, 2006 by Big Machine Records as Swift's debut single and the lead single from Swift's eponymous debut album. Swift wrote "Tim McGraw" during her freshman year of high school, knowing that she and her senior boyfriend would break up at the end of the year when he left for college. The song was written about all the different things that would remind the subject of Swift and their time spent together, once he departed. "Tim McGraw" is a musical interconnection of traditional and modern country music. Lyrically, the track lists items in order to associate a past relationship, one of them being country artist Tim McGraw's music.
Document 10: Stay (Black Stone Cherry song): "Stay" is a song by American rock band Black Stone Cherry, written by the band along with Joey Moi. Black Stone Cherry recorded it on their 2011 album "Between the Devil and the Deep Blue Sea", produced by Howard Benson.
Document 11: List of songs recorded by Taylor Swift: Taylor Swift is an American singer-songwriter. She signed a record deal with Big Machine Records in 2005 and released her eponymous debut album in 2006. Swift wrote three of the album's tracks: "Our Song", "Should've Said No", and "The Outside". The remaining eight were co-written with writers Liz Rose, Robert Ellis Orrall, Brian Maher, and Angelo Petraglia. In 2007, she released her first extended play (EP) "", which contains two original tracks written by her: "Christmases When You Were Mine" and "Christmas Must Be Something More".
Document 12: Stay (Shakespears Sister song): "Stay" is a song by UK based pop act Shakespears Sister, released by London Records in January 1992 as the second single from their album "Hormonally Yours". Upon release, the single became a global smash hit becoming the duo's first and only No. 1 single in numerous territories, including the UK, where it topped the UK Singles Chart for eight consecutive weeks; the longest UK No. 1 reign for any all-female band, and was the fourth biggest selling single of 1992. The single also held the No. 1 position in band member Siobhan Fahey's birthplace, Ireland, for six weeks, and it was a transatlantic hit reaching No. 4 on the "Billboard" Hot 100 in the US.
Document 13: You Belong with Me: "You Belong with Me" is a song performed by American singer-songwriter Taylor Swift. The song was co-written by Swift and Liz Rose and produced by Nathan Chapman with Swift's aid. It was released on April 18, 2009, by Big Machine Records as the third single from Swift's second studio album, "Fearless" (2008). Swift was inspired to write "You Belong with Me" after overhearing a male friend of hers arguing with his girlfriend through a phone call; she continued to develop a story line afterward. The song contains many pop music elements and its lyrics have Swift desiring an out-of-reach love interest.
Document 14: Fifteen (song): "Fifteen" is a country pop song performed by American singer-songwriter Taylor Swift. Swift self-penned the song and co-produced it along with Nathan Chapman. "Fifteen" was released on August 30, 2009 by Big Machine Records, as the fourth single from Swift's second studio album, "Fearless" (2008). The song was inspired by Swift's freshman year of high school at Hendersonville High School, where she first encountered heartbreak, along with her best friend Abigail Anderson. After writing it, Swift asked Anderson for authorization to record the song (due to personal references in the song); Anderson affirmed and it was ultimately included on "Fearless". "Fifteen" is a ballad, which has Swift reminiscing on events that occurred to her and her best friend at the age of 15 and cautioning teenagers to not fall in love easily.
Document 15: Stay (Wasting Time): "Stay (Wasting Time)" is a song by the Dave Matthews Band, released as the second single off their album "Before These Crowded Streets". As a single, it reached #8 on the Modern Rock Tracks chart, #33 on the Top 40 Mainstream, and #20 on the Adult 40. The song features The Lovely Ladies (Tawatha Agee, Cindy Myzell, and Brenda White King) on background vocals.
ground_truth: banjo