Heritage, Opeth’s tenth studio offering, finds the Swedish band abandoning death metal: no growled vocals, no blistering fast power riffs, no blastbeats. Mixed by Steven Wilson (Porcupine Tree, King Crimson) and engineered by Janne Hansson, Heritage is easily Opeth’s most musically adventurous — and indulgent — recording. Written primarily by vocalist/guitarist Mikael Åkerfeldt, these ten songs are 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 — ironic since keyboardist Per Wiberg left the band after Heritage was completed. Opening with the title track, a haunting solo piano instrumental, it careens into the explosive “The Devil’s Orchard,” with spectacular, arpeggiatic guitar work by Fredrik Åkesson and matching drums by Martin Axenrot. With a huge, swirling B-3 in the backdrop, it melds progressive metal to prog rock, with Åkerfeldt’s clear, clean singing. “I Feel the Dark” marries Åkerfeldt’s classical guitar to piano, flute, a droning Martin Mendez bassline, and double-timed, quietly tense drum kit work. “Slither” sounds like Motörhead meeting early-’70s Deep Purple. “Nepenthe” begins as a ballad but shifts toward jazz-rock in the instrumental break before finding its way back to a middle ground with sparse instrumentation and taut dynamics. “Haxprogress” draws real inspiration from King Crimson; Mellotrons and nylon-string guitars give way to Åkerfeldt’s crooning, thundering basslines, and syncopated drums. At eight-and-a-half minutes, “Famine” is the album’s most abstract cut, with guest Alex Acuña adding Latin percussion to the mix, creating spaciousness in a long intro before giving way to colliding prog rock at the seam where King Crimson’s “Larks Tongues in Aspic, Pt. 2″ meets Jethro Tull’s “Thick as a Brick.” “The Lines in My Hand” is the set’s most aggressive cut, with a deeply satisfying guitar crunch. “Folklore,” with its myriad instrumental and vocal parts, complex melody, and breakbeats, comes off as an eight-minute suite before closing with another jazz- and folk-inflected instrumental entitled “Marrow of the Earth.” Love it or hate it, Heritage, for its many excesses — and stellar conception and execution — is a brave album. It opens the door for Opeth to pursue many new directions and reinvent themselves as a band. [The Deluxe Edition includes a bonus DVD that includes two extra tracks, a full, 5.1 mix of Heritage, and an hour-long documentary on the making of the album.] – Thom Jurek