The metal legends were seen sidestage at the gig
The band previously covered the track back in 1984
The token apparently reached a peak of $3.37million (£2.6million) around 20 minutes after it was launched
The band have written and released three 'Unforgiven' tracks over the course of their career
The metal titans could be following in the footsteps of Billie Eilish, Lady Gaga and The Weeknd
DC superheroes and rock bands top the list
"You have anxiety build up, but don’t let it get the best of you"
The moment went viral during the band’s ongoing ‘72 Seasons’ tour
The closing track of the band’s 11th studio album ‘72 Seasons’ runs over 11 minutes
A fan wrote it "made for the coolest fucking intro of all time"