Recording superstars Jennifer Hudson, Lenny Kravitz, Pitbull, Ed Sheeran and Train are to perform on Wednesday's Season 9 finale of America's Got Talent, NBC said.
More guest performances are to be announced in the coming days, the television network said Thursday.
Finalists AcroArmy, Emily West, Mat Franco, Miguel Dakota, Quintavious Johnson and Sons of Serendip are to perform at New York's Radio City Musical Hall Tuesday, after which fans will vote for their favorite act.
The winner -- to be announced Wednesday -- will receive a $1 million prize and a headlining show in Las Vegas.