Question: What is the lead single of the album being promoted by Harry Styles: Live on Tour?

Context paragraphs:
Two Ghosts: "Two Ghosts" is a song recorded by English singer and songwriter Harry Styles for his self-titled debut studio album.  The song was written by Styles, John Ryan, Mitch Rowland and Tyler Johnson and its production was handled by Jeff Bhasker, Alex Salibian and Johnson.  It was released as the second single from the album to US hot adult contemporary radio via Columbia Records on 7 August 2017, and to contemporary hit radio the next day.

Story of My Life (One Direction song): "Story of My Life" is a song recorded by English Irish boy band One Direction.  It was released on 6 November 2013 by Syco Music and Columbia Records as the second single from the group's third studio album, "Midnight Memories" (2013).  Written by band members Niall Horan, Zayn Malik, Harry Styles, Liam Payne and Louis Tomlinson, along with Julian Bunetta, Jamie Scott, and John Ryan, the lyrics speak of a tumultuous relationship leading to lament and heartbreak.

As You Were (Show of Hands album): As You Were is the fourth live album by English acoustic roots duo Show of Hands.  Following the release of their acclaimed tenth studio album "Country Life" in 2003, which itself was promoted by a tour, the duo were named the "Best Live Act" at the 2004 BBC Radio 2 Folk Awards.  The live interest in the duo ultimately lead to a greater interest when the band announced their Autumn Tour 2004.  The tour itself ran from November–December and included Miranda Sykes as a collaborator, her first collaboration with the duo.  With the band's producer and engineer of the era Mick Dolan, the entire tour was recorded onto MiniDisc, with the duo subsequently ploughing through each concert recording the following day to identify the best performances and then collating and working through the "A list again" to find the best tracks to create the live album.

Alex Salibian: Alex Salibian is a music producer signed to Grammy-winning producer Jeff Bhasker's production company.  His most recent work includes producer and co-writer of Harry Styles solo debut album Harry Styles (album) as well as producer and co-writer of Young the Giant’s third album Home of the Strange.  Alex is also the musical director of Harry Styles’s band, starting with his performance on Saturday Night Live on April 15th, 2017

Sweet Creature: "Sweet Creature" is a song recorded by English singer and songwriter Harry Styles for his self-titled debut studio album (2017).  The song was written by Styles and Kid Harpoon, and its production was handled by the latter, Jeff Bhasker, Alex Salibian and Tyler Johnson.  It was released as a promotional single ahead of the album release.

Harry Styles: Live on Tour: Harry Styles - Live on Tour is the debut concert tour by British singer Harry Styles in support of his eponymous album (2017).  The tour began in September 2017, in San Francisco and will play over 80 concerts through to July 2018 in the Americas, Europe, Asia and Australasia.

Harry Styles (album): Harry Styles is the debut studio album by English singer and songwriter Harry Styles.  The album was released on 12 May 2017, through Columbia Records and Styles' own label, Erskine Records.  For the album, Styles worked with producers Jeff Bhasker, Alex Salibian, Tyler Johnson and Kid Harpoon.  The record was defined by music publications as a collection of soft rock, rock, Britpop and pop.  It received generally positive reviews from music critics, and commercially, it debuted atop the charts in several countries, including Australia, Canada, the UK and the US.  It was preceded by the release of its lead single, "Sign of the Times", while "Two Ghosts" served as the second single.  To promote the album, the singer is embarking on first headlining concert tour, .

Sign of the Times (Harry Styles song): "Sign of the Times" is the debut solo single by English singer and songwriter Harry Styles for his self-titled debut studio album.  It is his first single outside of the boy band One Direction.  Released on 7 April 2017, by Erskine and Columbia Records, it was written by Styles, Ryan Nasci, Mitch Rowland and its producers Jeff Bhasker, Tyler Johnson, and Alex Salibian.  Musically, it was defined by critics as a multi-genre ballad, including pop rock, soft rock and glam rock.  Its music video was released on 8 May.

Perfect (One Direction song): "Perfect" is a song by English-Irish boy band One Direction.  Released on 16 October 2015 as the second single from their fifth studio album "Made in the A.M.", it debuted at number one in Ireland, and reached the top 10 in several countries, including the United Kingdom, United States, France, New Zealand and Australia.  The song was written by members Harry Styles and Louis Tomlinson, along with the band's regular collaborators, Julian Bunetta and John Ryan among others.

Take Me Away (Avril Lavigne song): "Take Me Away" is a song by Canadian singer-songwriter Avril Lavigne, taken as a promotional single from her second studio album "Under My Skin" (2004).  It was written by herself and Evan Taubenfeld, whilst production was handled by Don Gilmore.  The song has a metal sound and started playing on Canadian rock radio in March 2004, at around the same time that the album's lead single, "Don't Tell Me", was being promoted.  The song was also included as the B-side on the physical release of "Don't Tell Me" in many regions, and re-released digitally as a promotional single from the album on May 24, 2004.  "Take Me Away" received mixed reviews from music critics.  Some critics complimented the composition and musical styles, whilst the rest criticized her songwriting and negatively compared it to the work of fellow Canadian artist Alanis Morissette.

Supporting paragraphs: Harry Styles: Live on Tour Harry Styles (album)
Answer: Sign of the Times