Jaimoe, Warren Haynes, Derek Trucks, Oteil Burbridge and Marc Quiñones have signed up to perform as The Brothers in April ...

"I could go on and on about every person in the cast and give a monologue about what's so great about them," the actor tells PEOPLE ...

The country singer joins John Legend, Michael Bublé and Adam Levine for season 27 of the reality competition series ...