The show starts on ITV in July and will follow the search for a lead in a new production of the composer's rock opera Jesus Christ Superstar.
> 'Jesus Christ Superstar' the reality show: Bonkers or brilliant?
Lloyd Webber confirmed in January that the winner of the show would play the title role in a new version for arenas.
Amanda Holden has confirmed that she will host the programme, while the contestants will be judged by Jason Donovan and Dawn French.
The show's co-creator Tim Rice has complained that the ITV talent contest is "tacky", adding: "I really don't think Superstar needs that tasteless reality television treatment."
Chris Moyles, Mel C and Tim Minchin have all signed up for parts in the revival, which will start on September 21.