Therion’s overall 17th album, Leviathan, is finally here! To celebrate the album’s release, the group has shared a video for the song “Tuonela.” The track features former Nighwishh singer and bassist Marko Hietala.

The Swedish symphonic metal outfit’s mastermind Christofer Johnsson comments:

“Like everyone else, I’m very sad and was also surprised to read that Marko is leaving NIGHTWISH. But I understand his reasons and the frustrations that many people share about the same tissues. But Marko has been active as a professional recording artist with various quality bands since the mid-80s, so I am absolutely sure in time we will see his return to the scene. He is simply too good to not be involved with music. But right now I hope he will take a good amount of time to just find himself and get the full energy and inspiration back on track.”

Watch the clip below: