NEW YORK, N.Y. – Broadway fans were treated to a surprise performance by Steve Martin and Edie Brickell at the end of their new musical, "Bright Star."

The cast had already taken their bows to a standing ovation when a part of the set was rotated to reveal Martin and Brickell to thunderous applause at the show's opening Thursday night at the Cort Theater. After taking their bows, director Walter Bobbie walked on stage and handed Martin a banjo. After strapping it on, they launched into "Sun's Gonna Shine," with Brickell and the show's star, Carmen Cusack, trading verses as the audience clapped along.

Martin and Brickell have recorded two albums together, including the 2013 Grammy-winning, "Love Has Come For You," but "Bright Star" is their first musical. The idea was sparked by the common love they share for musical theatre. Martin joked about their tastes at the shows after party.

"For Edie, it was 'The Sound of Music,' and for me it was 'Music Man' and 'West Side Story.' I have better taste," Martin said.

Martin elaborated on how influential musical theatre was for him, and why he wanted to write "Bright Star" with Brickell.

"When you think of 'Carousel' — with songs like 'My Boy Bill,' or 'Soliloquy' as it's called — or 'Oklahoma,' I grew up on those songs, and I thought everything was here," Martin said raising his hand above his head. "And the rest of the music world was down here. They were so emotive and expressive, and we had a longing to give it a shot."

The pair complement one another nicely, but at this point, Martin feels like he's the only one using his words.