Joe Perry collapsed onstage Sunday night while playing with Hollywood Vampires in Coney Island.
The Aerosmith guitarist was rushed to the hospital after going into cardiac arrest. He was just two songs into his set. The band finished their set without him.
Hollywood Vampires includes Perry, Johnny Depp, and Alice Cooper, who told the crowd that Perry had been "very sick before the show".
Through Twitter, Cooper also confirmed this morning that Perry was in stable condition, surrounded by his family, and "under the best care".
Superstar rockers Tom Morello, Nikki Sixx, and Kirk Hammett all tweeted their well wishes to Perry.
Aerosmith had been weighing the option of a farewell tour next year; no word as of yet if Sunday's incident affects their plans.