Opeth have released their new album, The Last Will and Testament, with a spotlight on the track “§4” featuring legendary Jethro Tull singer-flautist Ian Anderson.

Anderson contributes spoken word and flute playing to the seven-minute song, which takes listeners on a wild musical journey.

“‘§4’ is an oddball song, just written by instinct,” said Opeth frontman Mikael Åkerfeldt in a press release. “I’m not a clever guy when it comes to writing music. People call us ‘thinking man’s metal,’ I think that’s laughable. I listen to music from so many different genres, it’s impossible to me to stick to one genre.”

He continued, “We ended up with a flute solo by Ian Anderson of Jethro Tull, which was kind of an accident in a way, because I asked him to do a narration, not flute. As he was doing the spoken word bits, he asked me ‘do you need a flute solo?...