The group embarked on their third headling tour, the Where We Are Tour. Tickets sold out in minutes, and more shows were added due to "overwhelming demand." The tour was their first all-stadium tour, averaging 49,848 fans per show. In total, the tour grossed over $290 million and was the highest-grossing tour of 2014, the 15th highest-grossing concert tour of all time, and is still the highest-grossing tour of all time by a vocal group. The tour was attended by 3.4 million fans. In September 2014, One Direction's fourth book, "One Direction: Who We Are: Our Official Autobiography" was released. The group's second concert film, "", was released in October 2014, showing footage of the band's shows at San Siro Stadium in Milan, Italy. In November 2014, the group's fourth album, "Four", was released, making it the last album to include Zayn Malik. Singles "Steal My Girl" and "Night Changes" were released, both achieving platinum status in the US among other countries. The album debuted number one in 18 countries, selling 3.2 million copies. One Direction became the only group in the 58-year history of the "Billboard" 200 albums chart to have their first four albums debut at number one. The group embarked on their fourth headlining world tour, the On the Road Again Tour, grossing $208 million and selling 2.3 million tickets. In November 2015, One Direction's fifth album, "Made in the A.M.", was released. Singles "Drag Me Down" and "Perfect" both debuted at number one in various countries, and the album reached number one in the UK and number two on the US "Billboard 200". Following the release of the album, the group went on an indefinite hiatus. Following the departure of former member Zayn Malik, Payne was tasked with taking over the bulk of Malik's vocals. Bandmate Harry Styles admitted, "Liam [Payne] stepped up to do the high notes. He kicks them in the bollocks every show. He doesn't hold back." Payne was known as one of the principal songwriters in One Direction, credited for co-writing more than half of the songs on the band's third and fourth album. Payne began working as a producer under the monikers "Big Payno" or "Payno", teaming up with fellow producers AfterHrs to remix several tracks including Cheryl Cole's "I Don't Care" in 2014.