That super graphic ultra modern girl storming the stage with Chappell Roan? It was none other than Nancy Wilson . The Heart co-founder and her Grimace-purple guitar were surprise guests at Roan’s September 21 show at Forest Hills Stadium, where the duo performed what’s become a tour staple for the pop star this year: “Barracuda,” a blistering song about industry slimeballs that Wilson wrote with her sister, Ann, in the late ’70s. (Wilson previously told us it’s Heart’s ballsiest song and represents “the power of a couple marine-corps brats.”) Roan has recently been effusive in her adoration of “Barracuda,” telling the crowd, prior to Wilson’s appearance, how it’s among the greatest songs — perhaps even the greatest song — ever recorded. The experience left Wilson optimistic for what

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