The track, which had the working title "Jackie Chan", was originally recorded during GN'R's "Chinese Democracy" era.
Promoters pulled the plug mid-song after bumping up against the festival's hard 10 p.m. curfew.
Myles said: "We made a record earlier this year, and it's in the can."
The band kicked off its summer 2021 tour in July at Hersheypark Stadium in Pennsylvania.
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Wolfgang shared the news on his social media.
Clarke filled in for regular guitarist Keri Kelli, who was unable to make the gig.
The song is a reworked version of a previously unreleased track called "Silkworms".
The song is a reworked version of "Silkworms".
GN'R released performance clips filmed during the band's 2016 fall tour of South America and Mexico.
The performance was part of the Greater Los Angeles Zoo Association's (GLAZA) annual fundraiser, Beastly Ball.