On September 14, Swedish progressive metallers OPETH played a special show at the Stockholm, Sweden amusement park Gröna Lund. The park invites bands to perform on a one-by-one basis — it's not a gig you can book like any other date on a tour.

When the concert was originally announced earlier this year, OPETH frontman Mikael Åkerfeldt said, "Tremendous honor for us! Unbelievable. You can't book a stage like this as they are based on being invited to play. I've been there a million times throughout my life, mainly just getting sick in some roller coaster. Never did I think that my little band would be on that fucking stage. So humbled by this. I rarely get worked up for anything, but I am actually excited about this. I think it will be a magic night. We'll do our best to make it so anyways."

A 10-minute video clip featuring behind-the-scenes footage as well as clips of the band's performance can be seen below.

OPETH earlier in the year completed a North American co-headlining tour with MASTODON. The trek kicked off on April 4 in Portland, Maine, and visited more than 30 cities in the U.S. and Canada before wrapping up at Atlanta's Masquerade on May 12.

OPETH's latest album, "Heritage", sold 19,000 copies in the United States in its first week of release to debut at position No. 19 on The Billboard 200 chart. The band's previous studio CD, 2008's "Watershed", opened with more than 19,000 units to land at No. 23.