Josh Groban in ‘Sweeney Todd’ Revival

Groban, playing the title character, will be joined by Annaleigh Ashford in a production scheduled to open in March at the Lunt-Fontanne.

“Sweeney Todd,” the deliriously gruesome Stephen Sondheim-scored musical about a wronged man bent on revenge, will get a big-cast, big-orchestra,

big-budget revival next spring starring Josh Groban in the title role.

Groban, a pop star renowned for the timbre of his voice, will star in the title role opposite Annaleigh Ashford, who takes on the part of Todd’s co-conspirator, a pie shop owner named Mrs. Lovett.

The “Sweeney Todd” revival, quietly under discussion for 3 years and encouraged by Sondheim, has been one of the worst-kept secrets on Broadway,

speculated about for months on chat boards, and detailed last month in the email newsletter Broadway Journal.

On Tuesday, the production made it official: The revival will begin previews Feb. 26 and open March 26 at the 1,500-seat Lunt-Fontanne Theater.