to hook up with his old 'babe.' The big bosses of the town know that he's back... A lot of bad things start happening." Following a few live dates in Europe, Opeth returned to Studio Fredman to begin work on its next album, with Porcupine Tree's Steven Wilson producing. The band sought to recreate the recording experience of Still Life, and again entered the studio with minimal rehearsals, and no lyrics written. "This time it was tough," Åkerfeldt said, "I feel pleasantly blown away by the immense result, though. It was indeed worth the effort." Wilson also pushed the band to expand its sound, incorporating new sounds and production techniques. "Steve guided us into the realms of 'strange' noises for guitars and voice", Åkerfeldt said. Opeth released its fifth studio album, Blackwater Park, on 21 February 2001. AllMusic has stated that the album "keeps with Opeth's tradition by transcending the limits of death/black metal and repeatedly shattering the foundations of conventional songwriting". In support of Blackwater Park, Opeth embarked on its first world tour, headlined Europe for the first time, and made an appearance at the 2001 Wacken Open Air festival in Germany, playing to a crowd of 60,000. Deliverance and Damnation (2002–2004) Opeth returned to Sweden after touring in support of Blackwater Park, and began writing for the next album. At first, Åkerfeldt had trouble putting together new material: "I wanted to write something heavier than we'd ever done, still I had all these great mellow parts and arrangements which I didn't want to go to waste." Jonas Renkse of Katatonia, a long-time friend of Åkerfeldt, suggested writing music for two separate albums—one heavy and one soft. Excited at the prospect, Åkerfeldt agreed without consulting his bandmates or record label. While his bandmates liked the idea of recording two separate albums, Åkerfeldt had to convince the label: "I had to lie somewhat ... saying that we could do this recording very soon, it won't cost more than a regular single album." With most of the material written, the band rehearsed just once before entering Nacksving Studios in 2002, and again with producer Steven Wilson in Studio Fredman. Under pressure to complete both albums simultaneously, Åkerfeldt said the recording process was "the toughest test of our history." After recording basic tracks, the band moved production to England to first mix the heavy album, Deliverance, with Andy Sneap at Backstage Studios.