wrote the “Sweet Child O’ Mine” singers on their Twitter page just after midnight Wednesday. The scintillating single, titled “Absurd,” is the audio version of a song Guns N’ Roses performed at Fenway Park in Boston on Tuesday, Rolling Stone reported.However, the track is not technically “new,” per se, as it’s a reboot of a previously unreleased tune they wrote, “Silkworms,” which the group hadn’t performed since 2001.