On 4 December 2014, Chris Martin announced in an interview with Zane Lowe on BBC Radio 1 that Coldplay are in the middle of working on their seventh studio album, A Head Full of Dreams. Martin stated it might be the band's final album and compared it to Harry Potter; "It's our seventh thing, and the way we look at it, it's like the last Harry Potter book or something like that." He added that, unlike their promotion efforts for Ghost Stories, the band will tour for the seventh record. In an interview with Jo Whiley on BBC Radio 2, Martin hinted at the style of the album by saying that the band was trying to make something colourful and uplifting, yet not bombastic. He also stated that it will be something to "shuffle your feet" to.On 11 December 2014, the band unveiled a new song, "Miracles", which was written and recorded for the World War II drama film Unbroken directed by Angelina Jolie. At the 2015 Billboard Music Awards on 17 May, Ghost Stories was named Top Rock Album. On 26 September, Coldplay performed at the 2015 Global Citizen Festival in Central Park's Great Lawn in New York, an event organised by Chris Martin that advocates an end to extreme global poverty. Coldplay, along with Beyoncé, Ed Sheeran and Pearl Jam, headlined the festival, which was broadcast on NBC in the US on 27 September and the BBC in the UK on 28 September.Speaking on Nick Grimshaw's Radio 1 Breakfast Show on the BBC on 6 November, Coldplay confirmed 4 December as the release date of A Head Full of Dreams, and a new song from the album, "Adventure of a Lifetime", premiered on the show. The album features guest appearances from Beyoncé, Gwyneth Paltrow, Noel Gallagher, Tove Lo and Barack Obama. The album reached number one in the UK, and number two in the US, Australia and Canada among others, where it was kept off the top spot by Adele's 25. The music video for "Adventure of a Lifetime" featured the band performing as monkeys, and they were provided consultation with renowned performance capture actor Andy Serkis.On 27 November 2015, the first dates to their 2016 A Head Full of Dreams Tour were announced. Latin American and European legs were listed, which included three dates at Wembley Stadium, London in June. The North America Tour, an extra Wembley concert, and an Oceania tour, were later added. On 5 December, the band headlined the opening day of the 2015 Jingle Bell Ball at London's O2 Arena. On 7 February 2016 they headlined the Super Bowl 50 halftime show. The band were joined by Beyoncé and Bruno Mars. In April 2016, the band were named the sixth best selling artist worldwide in 2015.On 26 June 2016, Coldplay closed the final day of the Glastonbury Festival in England. Their performance included a duet with Barry Gibb, the last surviving member of the Bee Gees. During the band's second night at MetLife Stadium in New Jersey on 18 July, Coldplay were joined onstage by Michael J. Fox to recreate a Back to the Future scene. Martin sang "Earth Angel" before introducing Fox onstage to join the band in performing the Chuck Berry classic "Johnny B. Goode".The band performed a full set in India for the first time as part of the Global Citizen Festival in Mumbai on 19 November 2016. This performance was attended by 80,000 people and also featured many Bollywood stars during the concert. The same month, Coldplay announced in interviews with Absolute Radio and Magic Radio in London that they would be releasing new songs in a new EP called the "Kaleidoscope EP". Described as being made from a leftover "bag of ideas" from the recording of A Head Full of Dreams, Martin stated that it would be released in "a couple of months". The band officially announced that the EP would be released in 2017.On 22 February 2017, the band released a long-awaited and teased collaboration track with EDM duo The Chainsmokers called "Something Just Like This". The song was included on The Chainsmokers' album Memories...Do Not Open. Together, they debuted this song live at the 2017 Brit Awards with Chris Martin also performing a tribute song to the late George Michael. On 2 March, Chris Martin's birthday, the band announced the Kaleidoscope EP release date for 2 June 2017, and released a track from the EP, "Hypnotised". The EP will include "Hypnotised", a live remix of "Something Just Like This" recorded in Tokyo, and three new songs. The EP's release date was later pushed to 14 July with "All I Can Think About Is You" being released prior to the EP's release on 15 June 2017. On 15 August 2017, Coldplay announced that a live album covering their tour would be released in November (although as of April 2018, this has not yet been released). On 8 October 2017, Coldplay debuted live their new single "Life is Beautiful" during their concert at SDCCU Stadium in San Diego, California. The song was written in support after the earthquake that affected Mexico on 19 September. Part of the band's show was broadcast at the end of Estamos Unidos Mexicanos, a benefit concert taken place at Mexico City's Zócalo, which included "Fix You", "Viva La Vida", "Adventure of a Lifetime" and their new song. Martin stated that the concert's and song's proceeds would be destined to relief efforts for Mexico and other countries. A Head Full of Dreams Tour concluded in November 2017. Grossing over $523 million, it is the third highest-grossing concert tour in history.
