Drummer Tomas Haake says: "The 21-minute madness that is the song I is something we've always been extremely proud of. It wasn't written in the normal sense, but recorded without anything more than guidelines as to what style we wanted each part to have."

But there's not much chance of Meshuggah playing it live. "We often get the question," Haake says. "I'm sure it could be done with a lot of listening and hard work - but it's really too unstructured. It would take too much time and effort to make sense."