"Getting back to it. It's time. I miss it. I'm not scared anymore. No more excuses. No more allowing someone's else insecurities to dictate my relationship to music and singing. Boom," she captioned the clip from the studio.
"Also -- this is just a little demo of something Mike Viola and I worked on yesterday... but still, it's a start," she added.
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Viola is a Grammy-nominated music producer and songwriter who has done a lot of work with Moore's ex-husband Ryan Adams. These days she's engaged to another rock star, Dawes frontman Taylor Goldsmith.
Moore broke out as a pop star in 1999 with her hit single "Candy," but hasn't released a record since 2009's "Amanda Leigh." She previously told People she's gearing up to release more music even though she's no longer on a record label.
"I want to return to music," Moore said last summer. "I don't have a record label, but I have a lot of music written. Next year, I've decided I'm putting it out there!"
Moore returns to television this fall when Season 3 of "This Is Us" premieres on NBC this fall, and voices Rapunzel in Disney's "Wreck-It Ralph" sequel, "Ralph Breaks the Internet," hitting theaters on Nov. 21.