Broadway creatives take listeners behind the music on their cast albums in a new Ghostlight series.
Mueller's Tony-nominated costars Jarrod Spector and Anika Larsen have also extended their contracts.
Campbell will replace Jake Epstein in the role of Gerry Goffin.
The new musical will open in the West End at London's Aldwych Theatre in 2015.
Tony nominee Jessie Mueller leads the cast with Jake Epstein, Anika Larsen, and Jarrod Spector.
Jerry Seinfeld, Bernadette Peters, and Clive Davis were also on hand to cheer for Jessie Mueller and the cast of the new musical.
Jake Epstein, Jarrod Spector, Anika Larsen, Liz Larsen, and Jeb Brown also light up the stage in this new bio-musical.
J/K! He was always beautiful.