Sara Bareilles Sings From WAITRESS Album; Watch the Lyric Video for 'She Used to Be Mine'!

The world premiere, Broadway-bound musicalWaitress, based on the motion picture written by Adrienne Shelly, with a book by Jessie Nelson, music & lyrics by Sara Bareilles, direction by Diane Paulus, and choreography by Chase Brock, wraps up this weekend at American Repertory Theater (A.R.T.) at Harvard University. The show won't open in New York until the Spring, but fans need not wait that long for a taste of what's to come.

According to the Hollywood Reporter, Bareilles will release an album of songs from the show, titled What's Inside: Songs From Waitress, this fall through Epic Records. Below, check out the lyric video for the single "She Used to Be Mine".

She told THR: "I fell more deeply in love with the writing of the musical Waitress than I had ever imagined. It proved impossible for me to imagine handing over the songs to the show before selfishly finding a way to sing them myself. This is a deliciously self-indulgent project and I'm sorry, I'm not sorry. :)"

The complete cast includes Jessie Mueller as Jenna, Jeanna de Waal as Dawn, Drew Gehling as Dr. Pomatter, Dakin Matthews as Joe, Keala Settle as Becky, Eric Anderson as Cal, Jeremy Morse as Ogie, and Joe Tippett as Earl. Ensemble members are Charity Angel Dawson, David Jennings, Corey Mach, Ragan Pharris, Cullen R. Titmas, and Stephanie Torns.

Jenna, a Waitress and expert pie maker, is stuck in a small town and a loveless marriage. When a baking contest in a nearby county offers her a chance at escape, Jenna must weigh her commitments against a rare shot at freedom and recognition. Her customers, co-workers, and the town's handsome new doctor all offer her conflicting recipes for happiness - but Jenna must ultimately decide for herself.

Featuring music and lyrics by Grammy-nominated singer-songwriter Sara Bareilles ("Brave," "Love Song") and directed by Diane Paulus (Pippin, Finding Neverland), this poignant and uplifting new musical celebrates talent hiding in the most unlikely places.