UPDATE: It might be "self-indulgent," but "She Used To Be Mine" will likely prove to be a crowd-pleaser. It's really, really pretty, guys—listen below.

In case "Love Song" wasn't clear enough, Sara Bareilles isn't in the business of writing songs to appease, and the point still stands.

The Blessed Unrest singer, whose Waitress musical will hit Broadway next year, announced today (September 24) that she's preceding its premiere with the release of her fourth studio album, What’s Inside: Songs From Waitress, according to Billboard. And she's happy to report that it's her, through and through.

"I fell more deeply in love with the writing of the musical Waitress than I had ever imagined," Bareilles, who wrote the play's music and lyrics, said. “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 studio version of "She Used To Be Mine" is the work's first single, and will be released tomorrow (September 25).

Waitress, based on the eponymous 2007 film starring Keri Russell and directed by the late Adrienne Shelly, centers on a depressed server and pie-maker who's struggling to skip town. Billboard reported in August that production will begin at New York City's Brooks Atkinson Theater in April and Diane Paulus, who most recently worked on Pippin and Finding Neverland, will direct the show. Previews for the show will begin in March, according to Playbill.

Pumped to hear there are new Bareilles tunes on the way? Hang tight for tomorrow's release.

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