As part of the ongoing series of Led Zeppelin reissues with coveted bonus tracks, next month will see the re-release of what is arguably the band’s greatest moment in their recorded history, the two-record set Physical Graffiti, which was originally released 40 years ago this year.

A bonus track from the upcoming re-mastered package has gone viral, an early, previously unreleased and rough around the edges mix of one of the band’s most well known tunes, the FM radio staple “Houses of the Holy,” which was originally recorded in 1972 and was intended to be the title song of Zep’s 1973 record of the same name, but was pulled at the last minute as the band felt it “didn’t fit” on that release.