During the recording sessions, U2 allowed manager Paul McGuinness to book their upcoming PopMart Tour before they had completed the album, putting the tour's start date at April 1997. The album was originally planned to be completed and released in time for the 1996 Christmas and holiday season, but the band found themselves struggling to complete songs, necessitating a delay in the album's release date until March 1997. Even with the extended timeframe to complete the album, recording continued up to the last minute. Bono devised and recorded the chorus to "Last Night on Earth" on, coincidentally, the last night of the album's recording and mixing. When Howie B and the Edge took the album to New York City to be mastered, changes and additions to the songs were still being made. During the process, Howie B was adding effects to "Discothèque", while the Edge was recording backing vocals for "The Playboy Mansion". Of the last minute changes, the Edge said, "It's a sign of absolute madness." Flood says, "We had three different mixes of 'Mofo', and during mastering in November '96 in New York, I edited a final version of 'Mofo' from these three mixes. So even during mastering, we were trying to push the song to another level. It was a long process of experimentation; the album didn't actually come together until the last few months."