Question: Who did the performer who sings Everything Has Changed with Taylor Swift write the song Thinking Out Loud for?

full_context: Document 1: We Are Never Ever Getting Back Together: After writing Speak Now (2010) entirely solo, Swift opted to collaborate with different songwriters and producers for Red. Thus, she called Max Martin and Shellback, two songwriters and producers whose work she admired, to discuss a possible collaboration. The trio conceived the concept for ``We Are Never Ever Getting Back Together ''shortly after a friend of Swift's ex-boyfriend walked into the recording studio and spoke of rumors he heard that Swift and her former flame were reuniting. After the friend left, Martin and Shellback asked Swift to elaborate on the details of the relationship, which she described as`` break up, get back together, break up, get back together, just, ugh, the worst''. When Martin suggested that they write about the incident. Swift began playing the guitar and singing, ``We are never ever... '', and the song flowed rapidly afterwards. She described the process as one of the most humorous experiences she had while recording, and said the musical partners matched her expectations. An audio clip of her sarcastically speaking about breakups can be heard before the final chorus. The song is reportedly about Swift's ex, Jake Gyllenhaal, as the two had broken up in January 2011 but had been seen on a date a few days later. After the release of the music video, more clues linking the song to Gyllenhaal emerged, with the actor looking like Gyllenhaal, the actor in the video giving her a scarf as Gyllenhaal had reportedly done for Swift and a bracelet Swift wears in the video that is speculated to look similar to that of which Gyllenhaal was rumored to have given Swift for her birthday.
Document 2: From This Moment On (Shania Twain song): ``From This Moment On ''was written during a soccer game in Italy. Twain once explained,`` We were in Italy at a soccer game. My husband loves sports. I do n't know the game that well, so my mind drifted and I started writing.'' Initially, Twain thought that ``From This Moment On ''would be perfect for singer Celine Dion; however, as Twain and Lange developed the song, they concluded that it would work best as a duet. While their first choice for the duet was Elton John, they chose country singer Bryan White. Twain later described White as`` the best male voice in country music. Beyond country music! He's an excellent singer. So he needed to be on this record, because the song soars. It demands that. It demands dynamics.'' White explained that, by the time he went to the recording, the song was mostly finalized, and described it as' extremely challenging 'vocally.
Document 3: Songs I Wrote with Amy: Songs I Wrote with Amy is an extended play, independently released by Ed Sheeran on April 4, 2010. After the success of +, Sheeran re-released five of his EPs, including "Songs I Wrote with Amy", which was released a second time on December 9, 2011. All of the songs were written collaboratively by Ed Sheeran and Amy Wadge.
Document 4: Thinking Out Loud: In the kitchen, Sheeran and Wadge began writing the song at 2: 00 am on 4 February 2014, and completed it in 20 minutes. According to Wadge, the lyrical content resulted from her and Sheeran's talking about ``everlasting love '', inspired by the circumstances relevant at that time. Sheeran also revealed that the lyrics were inspired by his then - girlfriend, Athina Andrelos, whom Sheeran met in early 2014. Sheeran would later explain that he wrote the song`` in a relationship at a really, really happy point''. Immediately after writing, Sheeran recorded the song on his phone. He was keen to include ``Thinking Out Loud ''on the second album. He properly recorded the song the following day at the Sticky Studios, a recording facility located in the small Surrey village of Windlesham, and informed Wadge of its inclusion on the album. It became the last song recorded for the album. For`` Thinking Out Loud'', Sheeran sought the assistance of Jake Gosling, who produced much of his debut album and had earlier contributed tracks, four of which appear on the standard version of the second album.
Document 5: The Long and Winding Road: Paul McCartney said he came up with the title ``The Long and Winding Road ''during one of his first visits to his property High Park Farm, near Campbeltown in Scotland, which he purchased in June 1966. The phrase was inspired by the sight of a road`` stretching up into the hills'' in the remote Highlands surroundings of lochs and distant mountains. He wrote the song at his farm in 1968, inspired by the growing tension among the Beatles. Based on other comments McCartney has made, author Howard Sounes writes, the lyrics can be seen as McCartney expressing his anguish at the direction his personal life was taking in the autumn of 1968, after he had separated from his fiancée Jane Asher, as well as a nostalgic look back at the Beatles' history. McCartney recalled: ``I just sat down at my piano in Scotland, started playing and came up with that song, imagining it was going to be done by someone like Ray Charles. I have always found inspiration in the calm beauty of Scotland and again it proved the place where I found inspiration. ''
Document 6: Back to December: ``Back to December ''is a song written and recorded by American singer / songwriter Taylor Swift for her third studio album Speak Now (2010). The song was sent to country radio in the United States on November 15, 2010, as the second single from Speak Now. According to Swift,`` Back to December'' is the first time she ever apologizes to someone in a song. Critics speculate that the song is about Taylor Lautner, Swift's ex-boyfriend, which was later acknowledged by Lautner. ``Back to December ''is considered an orchestral country pop ballad and its lyrics are a remorseful plea for forgiveness for breaking up with a former lover.
Document 7: Gorgeous (Taylor Swift song): Swift co-wrote ``Gorgeous ''with its producers Max Martin and Shellback. It has been described as a`` radio - friendly pop'' song. Lyrically, the song depicts ``the pursuit of a maddening love interest '', whom Swift describes as`` gorgeous''. Hugh McIntyre of Forbes characterized the production of the song as ``simultaneously a basic 808 drum and an attempt at something that pushes electro - pop into a more interesting territory than Top 40 is used to ''. Maeve McDermott of USA Today likened the chorus of the song to the sound of Katy Perry. According to Elle, the man mentioned in the song is the British actor Joe Alwyn, who is Swift's current boyfriend. The song is composed in the key of C major with a tempo of 92 beats per minute, with Swift's vocals spanning from C to F.
Document 8: Sing (Ed Sheeran song): "Sing" is a song by English singer-songwriter, Ed Sheeran. It was written by Sheeran and Pharrell Williams, who also produced it and provided uncredited background vocals. The song was released on 7 April 2014, serving as the lead single from Sheeran's second studio album, "×" (2014). The song became Sheeran's first UK number-one single and also topped the charts in Australia, New Zealand and Ireland. It also peaked at No. 13 on the US "Billboard" Hot 100.
Document 9: Back to December: "Back to December" is a song written and recorded by American singer-songwriter Taylor Swift for her third studio album "Speak Now" (2010). The song was sent to country radio in the United States on November 15, 2010, as the second single from "Speak Now". According to Swift, "Back to December" is the first time she ever apologizes to someone in a song. Critics speculate that the song is about Taylor Lautner, Swift's ex-boyfriend, which was later acknowledged by Lautner. "Back to December" is considered an orchestral country pop ballad and its lyrics are a remorseful plea for forgiveness for breaking up with a former lover.
Document 10: 22 (Taylor Swift song): ``22 ''is a song recorded by American singer - songwriter Taylor Swift for her fourth album, Red (2012). It was written by Swift along with Max Martin and Shellback. The song was released as the album's fourth single on March 12, 2013. The lyrics describe the joys of being 22 years old.
Document 11: Perfect (Ed Sheeran song): ``Perfect ''is a song by English singer - songwriter Ed Sheeran from his third studio album, ÷ (2017). After the album's release it charted at number four on the UK Singles Chart. On 21 August 2017, Billboard announced that`` Perfect'' would be the fourth single from the album. The song was serviced to pop radio on 26 September 2017, as the third single from the album in the United States (fourth overall). The song eventually reached number one on the UK Singles Chart and the US Billboard Hot 100 in December 2017. It also peaked at number one in sixteen other countries, including Australia, Canada, Ireland and New Zealand. A version of ``Perfect '', titled`` Perfect Duet'', with American singer Beyoncé was released on 1 December 2017. Another duet with Italian tenor Andrea Bocelli, titled ``Perfect Symphony '', was released on 15 December 2017.`` Perfect'' also became the UK Christmas number - one song for 2017.
Document 12: Out of the Woods (song): ``Out of the Woods ''is a song by American singer - songwriter Taylor Swift. The song was written and produced by Swift and Jack Antonoff of fun... It was the second song to be officially released from her fifth studio album 1989, serving as the first promotional single on October 14, 2014. It is the fourth track on the album, after`` Style''. ``Out of the Woods ''serves as the sixth official single with an accompanying music video that premiered on December 31, 2015, during Dick Clark's New Year's Rockin 'Eve on ABC. It was released to radio on February 5, 2016. The song went number one in Israel and has reached the top 10 in Belgium, Canada, and New Zealand as well as the top 20 in Australia and the United States.
Document 13: Everything Has Changed: ``Everything Has Changed ''is a song written and performed by American singer - songwriter Taylor Swift and English singer - songwriter Ed Sheeran, taken from Swift's fourth studio album, Red (2012). Produced by Butch Walker, the track was released as the sixth single from the album on July 16, 2013.`` Everything Has Changed'' is a guitar ballad combining folk and pop genres about ``wanting to get to know a new lover better ''.
Document 14: Photograph (Ed Sheeran song): "Photograph" is a song recorded by the English singer-songwriter, Ed Sheeran, for his second studio album, "×" (2014). Sheeran wrote the song with Snow Patrol member, Johnny McDaid, who had a piano loop from which the composition developed. After recording several versions with other producers, Sheeran eventually solicited help from Jeff Bhasker; the collaboration generated a version that Bhasker further enhanced for months. The ballad derives its music primarily from an acoustic guitar, piano and programmed drums. With visually descriptive lyrics, it discusses a long-distance relationship inspired by Sheeran's own experience of being away from his then-girlfriend while he was on tour.
Document 15: 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.
ground_truth: his then - girlfriend, Athina Andrelos
sub_queries: who sings everything has changed with taylor swift Answer: Ed Sheeran
who did Ed Sheeran wrote the song thinking out loud for Answer: his then - girlfriend, Athina Andrelos