Question: Which American singer-sonwriter is known for the album supporting tour The 1989 World Tour and the charity single Ronan released in 2012 ?
Context: The Catch Me: Live World Tour (stylized as TVXQ!  Live World Tour "Catch Me"), also known as the Catch Me World Tour, was the fourth world concert tour (ninth overall) by South Korean pop duo TVXQ, to support their sixth studio album, "Catch Me" (2012).  The world tour commenced with two shows in Seoul in November 2012.  The tour visited seven theatres, arenas, and stadiums from late 2012 through mid-2013. Dance Again World Tour was the first worldwide concert tour by American entertainer Jennifer Lopez.  Throughout majority her music career, beginning in 1999, a world tour by Lopez was anticipated, though it never materialized.  Following the release of her seventh studio album "Love? " (2011), she was more intent on touring than ever.  However, it was not until March 2012 when the tour came into the works.  As rumors began to circulate, Lopez later confirmed that April that she would be embarking on her first ever world tour.  She was joined by Spanish recording artist Enrique Iglesias for the North American leg of the tour, which was presented by State Farm Insurance and promoted by AEG Live.  The Dance Again World Tour also visited Australia, Asia, South America and Europe.  It commenced on June 14, 2012 in Panama, and concluded on December 22, 2012 in Puerto Rico. American singer Beyoncé has embarked on six concert tours during her solo career, four of which have been worldwide and two of which have been collaborative.  Her solo tour debut (whilst on hiatus with Destiny's Child) began in 2003, with the Dangerously in Love Tour.  Based predominantly in the United Kingdom, the tour received an unfavorable review from Dave Simpson of "The Guardian" based on Beyoncé's costumes and a confusion of her core audience at the time.  In 2007, she embarked on her first major solo world tour – The Beyoncé Experience, following Destiny's Child's disbandment in 2005.  The tour visited five continents and Beyoncé was lauded by music journalism for her simultaneous dancing and singing abilities.  Following the release of her 2008 third studio album "I Am... Sasha Fierce", Beyoncé embarked on her next world concert venture, the I Am... World Tour.  She collaborated with Thierry Mugler exclusively for the tour's costumes.  The I Am... World Tour also marked the first time Beyoncé had performed in South American countries.  Beyoncé saw her most commercially successful tour to date with 2013-2014's The Mrs. Carter Show World Tour.  Grossing US $229,727,960, the 132 date venture was criticised for the name of the tour, as Beyoncé appeared to be letting herself be known as simply Shawn "Jay-Z" Carter's wife, despite being proclaimed as a "modern-day feminist".  The tour itself however was lauded by music critics, who again praised Beyoncé's performance abilities and the more advanced production seen compared to her previous tours. The Maiden England World Tour was a concert tour by Iron Maiden, which began on 21 June 2012 in Charlotte, North Carolina and ended on 5 July 2014 with a performance at the Sonisphere Festival at Knebworth, UK.  The tour's setlist was largely based on the original 1989 concert video of the same name, shot during the Seventh Tour of a Seventh Tour in 1988, which was re-released in 2013.  Because of this, the tour's setlist consisted almost entirely of the band's 1980s material, with a particular focus on their 1988 album, "Seventh Son of a Seventh Son".  The stage show was also based on the original tour and featured numerous pyrotechnic effects in addition to multiple appearances by the band's mascot, Eddie.  Following 2005's Eddie Rips Up the World Tour and 2008–2009's Somewhere Back in Time World Tour, this was the group's third and final tour inspired by a particular period of their history. American singer Demi Lovato has embarked six concert tours and performed live at various award ceremonies and television shows.  Her debut promotional tour in 2008, Demi Live!  Warm Up Tour was based in North America only and supported her debut studio album, "Don't Forget" (2008).  At the same year, Lovato served as one of the opening acts for Jonas Brothers on their fifth concert tour, Burnin' Up Tour.  Lovato also served as one of the opening acts for Avril Lavigne on her third concert tour, The Best Damn World Tour on selected dates in North America.  In 2009, Lovato performed as the opening act on the Jonas Brothers World Tour 2009 with Jonas Brothers during the South American and European legs, before she continued to tour her first headlining tour, during Summer 2009, promoting her debut album "Don't Forget" and her sophomore album "Here We Go Again".  The tour featured opening acts, David Archuleta, Jordan Pruitt and KSM.  In 2010, Lovato performed as the opening act on Jonas Brothers' Live in Concert World Tour 2010.  On November 1, 2010, Lovato left the tour after a dispute arose to the public light involving her apparently punching one of the dancers of the tour.  After Lovato left, she was interned in a treatment center to seek out help. "El Dorado" is the second track from English heavy metal band Iron Maiden's 2010 album "The Final Frontier".  The song is the band's forty-first single, and the only one from the album.  It was made available as a free download on the band's official site at 00:01 on 8 June 2010 (UTC), one day before the album's supporting tour began.  The cover art was created by Anthony Dry and is based on the covers of the EC Comics published by William Gaines that were popular in the 1950s.  Regarding the early online release of the song, vocalist Bruce Dickinson explained, "El Dorado is a preview of the forthcoming studio album.  As we will be including it in the set of our Final Frontier World Tour, we thought it would be great to thank all our fans and get them into The Final Frontier mood by giving them this song up front of the tour and album release." "Ronan" is a charity single released on September 8, 2012, by American singer Taylor Swift to the iTunes Store.  Swift's lyrics are based on a blog she read about a four-year-old boy, Ronan Thompson, who died from neuroblastoma in 2011.  Swift wrote the song by putting together quotes from blog creator Maya Thompson, Ronan's mother.  Thompson is credited as a co-writer of the song.  Swift first performed the song live for Stand Up to Cancer in September 2012, and has only performed it publicly one other time, at the Glendale, Arizona stop of The 1989 World Tour, at which Thompson was in attendance.  All proceeds from sales of the single go to help fight cancer. The World Tour is the second concert tour by British girl group Bananarama.  The first tour was a "warm up" under the name of "Lovekids Tour 1988" and was only performed in Japan.  The 1989 World Tour supported four studio albums, "Deep Sea Skiving", "Bananarama", "True Confessions", and "Wow! ". Rock or Bust is a studio album by Australian hard rock band AC/DC.  It is their fifteenth internationally released studio album and the sixteenth to be released in Australia.  It is the shortest studio album ever released by the band; at approximately 35 minutes, it is two minutes shorter than their previous shortest album, "Flick of the Switch", which was released in 1983.  "Rock or Bust" also was the group's first album without founding member and rhythm guitarist Malcolm Young, who had retired from the band in 2014 due to health concerns, although he co-wrote every track on the album.  Bass guitarist Cliff Williams has also retired since "Rock or Bust" was released, drummer Phil Rudd was unable to participate in the supporting tour after being sentenced to house arrest, and vocalist Brian Johnson was forced to exit the band after the fifth leg of the album's supporting tour as a result of hearing loss. The 1989 World Tour was the fourth concert tour by American singer-songwriter Taylor Swift, in support of her fifth studio album, "1989" (2014).  The tour's European and North American dates, as well as two shows in Japan, were announced in November 2014, followed by the Oceania dates in December 2014.  Additional dates for Singapore and Shanghai were announced in June 2015 with a third and final Melbourne show announced in July 2015.  The tour began on May 5, 2015, in Tokyo, Japan and concluded on December 12, 2015 in Melbourne, Australia, the day before her 26th birthday.  The tour became Swift's highest grossing and most attended tour to date, mobilizing 2,278,647 fans and $250,733,097 revenue.  It was the highest grossing tour in the world in 2015.
Answer: Taylor Swift