OPETH frontman Mikael Åkerfeldt has recorded a guest appearance on the track "Unhealer" from the forthcoming solo album from former EMPEROR vocalist/guitarist Ihsahn, entitled "angL".Commented Ihsahn: "We've been talking about doing something for a while and I'm really happy it finally came together. Needless to say, Mikael's performance is nothing short of amazing!" Asgeir Mickelson and Lars Norberg (both of SPIRAL ARCHITECT) were responsible for laying down the drum and bass tracks on the CD, respectively. Ihsahn said, "Asgeir and Lars have delivered a rock-solid foundation for the whole album. Pounding blast-beats to slow fretless passages are all performed with great precision." "angL" is tentatively due mid-spring via Mnemosyne Productions/Candlelight Records. Ihsahn previously described the musical direction of the new CD as "a natural progression from 'The Adversary' , but with a somewhat heavier touch." "The Adversary" entered the Norwegian album chart at position No. 33 upon its release in 2006. The CD was written and recorded over a one-year period at Symphonique Studios in Norway and features a guest appearance by Garm from ULVER on one song. All music and lyrics for "The Adversary" were written and performed by Ihsahn with exception of drums, which were played by Asgeir Mickelson (BORKNAGAR, SPIRAL ARCHITECT). A video for "Invocation", the opening track from "The Adversary", can be viewed below. The clip was shot and produced in Notodden, Norway by a local production company. "I think the video reflects both the direct and solitary expression of the album," Ihsahn said. "It was my intention to keep everything as pure and intense as possible, yet staying true to metal tradition."