Joe Perry was taken to the hospital after making a surprise onstage appearance at Billy Joel’s Madison Square Garden concert Saturday.

According to sources, Perry collapsed in his dressing room after the Aerosmith guitarist performed “Walk This Way” with Joel and his band. Paramedics attended to Perry for 40 minutes in the rocker’s dressing room – including reportedly “placing a tracheal tube down his throat to clear the air path” – before Perry was taken out of the venue on a stretcher and rushed to a New York hospital.

“Following a guest performance during Billy Joel’s show last night at Madison Square Garden, Joe Perry experienced shortness of breath and was treated backstage by paramedics who gave the guitarist oxygen and used a tracheal tube to clear his airway before taking him to a hospital,” a rep for Perry said in a statement to Rolling Stone. “This morning Perry remains in the hospital where he is alert and responsive. The Aerosmith guitarist will be unable to appear today at Rock And Roll Fantasy Camp in Florida and apologizes to those attending. Perry is expected to return to the road later this month.”