Jon Bon Jovi sits down with ET's Nischelle Turner at the iHeart Studios in Los Angeles before the premiere of his new docuseries, 'Thank You, Goodnight: The Bon Jovi Story,' streaming on April 26 on Hulu and Disney+. The rocker opens up about his health challenges and reveals he’s doing vocal therapy. He also shares where his relationship stands with Bon Jovi bandmate Richie Sambora.