The trio appeared at the Apple Store in New York's SoHo to perform selections from Broadway's Carole King Musical.
Pageant features a book and lyrics by two-time Tony nominee Bill Russell and Frank Kelly, with music by Albert Evans.
The cast performed at Barnes & Noble before signing CDs for fans.
Composer Alan Menken joins the performers as they create a new cast album.
The musical features the Academy Award-winning music and lyrics of Glen Hansard and Markéta Irglová.