Deep Purple did concert tours in 48 countries in 2011. The Songs That Built Rock Tour used a 38-piece orchestra, and included a performance at the O2 Arena in London. Until May 2011, the band members had disagreed about whether to make a new studio album, because it would not really make money any more. Roger Glover stated that Deep Purple should make a new studio album "even if it costs us money." In early 2011, David Coverdale and Glenn Hughes told VH1 they would like to reunite with former Deep Purple Mark III line-up for the right opportunity, such as a benefit concert. The current band's chief sound engineer on nine years of tours, Moray McMillin, died in September 2011, aged 57. After a lot of songwriting sessions in Europe, Deep Purple decided to record through the summer of 2012, and the band announced they would release their new studio album in 2013. Steve Morse announced to French magazine "Rock Hard" that the new studio album would be produced by Bob Ezrin.