In sync with the release of 2013's self-titled, eighth studio album, the band played an exclusive, one-off show at Den Norske Opera & Ballett in Oslo, Norway on September 8, 2013, where they were joined by the Norwegian National Opera Chorus as part of the Ultima Oslo Contemporary Music Festival.

Frontman Sigurd 'Satyr' Wongraven explains how the project came together. He says: "The whole thing started with us doing one song, To The Mountains, a year and a half before the actual show. We performed at a closed event in the main hall of the opera with the Royal Norwegian Opera Chorus. It was very inspirational.

"I then said to the conductor that I would love to do a whole show like this. He loved the idea, I was serious about it, and he was serious about it. We spent approximately one and a half year working with composer and arranger Kjetil Bjerkestrand on the choral arrangements."