Slash wrote the majority of the music for World On Fire
when he was on the Apocalyptic Love
tour. "Just sitting around in dressing rooms and hotel rooms for a year, I accumulated all these ideas," he explained to MusicRadar.com
. "Then in September  I sat down and went through everything I'd recorded on my voice memo on my phone and picked out about 20 different ideas then we went into pre-production in October and just started jamming. We were there for a couple of months, holed up in Mates rehearsal studio in Los Angeles."
"There was the whole writing process then once we had all the songs down we rehearsed the s--t out of it, and then we brought the producer, Mike Baskette, in," Slash continued. "And so we went through another phase of fine tooth-combing everything and getting the arrangements together. Myles came down and started working on his vocal parts… and by the time we were done with all that we were ready to go in and just bang the stuff out. It was a very quick process in the studio."