 Opeth released its fifth studio album , Blackwater Park , on February 21 , 2001 . Allmusic called Blackwater Park " astounding , a work of breathtaking creative breadth , " noting 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 . 
