This is Obituary's cover of Celtic Frost's song from Celtic Frost's second studio album To Mega Therion
, although the song also appeared as a bonus track on Celtic Frost's 1999 remaster, Morbid Tales/Emperor's Return
. Obituary's cover of "Circle of the Tyrants" appears as the fourth track of Cause of Death
. "Circle of Tyrants" was written by Celtic Frost founder Tom Warrior.
In the book Precious Metal: Decibel Presents the Stories Behind 25 Extreme Metal Masterpieces
, rhythm guitarist Trevor Peres gives us a clue how this cover came about: "[Drummer] Donald [Tardy] and I were still in the studio room and I started playing the first riff off 'Circle of Tyrants,' and Donald kicked in. He knew what it was because we used to play it live, as well as other Celtic Frost songs we used to play. We didn't know it and [producer] Scotty [Burns] hit record, just playing around..." The band later listened to the tape and liked what they heard, deciding to include it on the album on the spot.