The trio appeared at the Apple Store in New York's SoHo to perform selections from Broadway's Carole King Musical.
Broadway vets including Victoria Clark, Lauren Worsham, and Marc Kudisch also took part in the evening.
Miranda's new musical will play the Public Theater.
The solo show stars Jonny Donahoe.
Lansbury looks so delightful in these new photos.
The former Pussycat Dolls frontwoman leads the cast of Andrew Lloyd Webber's musical at the London Palladium.
The Collegiate Chorale presents the musical, inspired by the film Life of Brian, at Carnegie Hall.
Lisa D'Amour's drama premieres in Chicago before opening on Broadway.
The former member of The Pussycat Dolls takes on Andrew Lloyd Webber.