 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 <unk> of <unk> , a long @-@ time friend of Åkerfeldt , suggested writing music for two separate albums — one heavy and one soft . 
