 The first two songs Åkerfeldt wrote for Heritage were in the style of Watershed . After hearing the songs for the first time , Martín Méndez told Åkerfeldt that he would be disappointed if the album continued in that direction . Relieved that Méndez was not interested in doing another conventional Opeth album , Åkerfeldt scrapped the two songs and started the writing process over in a different style . In the press release for Heritage , Mikael Åkerfeldt revealed that he felt as though he had been building to write the album since he was 19 years old . In a review for Allmusic , Thom Jurek called Heritage the band 's most adventurous album , describing the songs as " drenched in instrumental interludes , knotty key and chord changes , shifting time signatures , clean vocals , and a keyboard @-@ heavy instrumentation that includes Mellotrons , Rhodes pianos , and Hammond organs " . 
