Michael Cormier-O’Leary is a composer, multi-instrumentalist, songwriter, and producer based in Philadelphia. His upcoming work for film includes musical scores for two narrative short films (Gribbon, dir. by Josh Kay, and Shut Up, Ian dir. by Zoe Ettinger), a feature-length documentary (Car Brain, dir. by Matt Ober and Reed McCoy), and a feature-length horror film (untitled project by Hayden Hall). He is also credited with scoring music for podcasts Drifting Off With Joe Pera, Otherworld, and season 3 of APM's Spectacular Failures. ​

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Cormier-O'Leary is the primary composer and bandleader of the shape-shifting instrumental collective, Hour. With twin 2018 releases (Tiny Houses and Anemone Red), Hour has received accolades from Stereogum, Pitchfork, and NPR, among others. Comedian Joe Pera cited Tiny Houses as being a record he had on heavy rotation during the writing of season 3 of his Adult Swim show Joe Pera Talks With You. Hour released Ease the Work in April of 2024 and toured extensively in support of it, including appearances at SXSW, Thing in the Spring, and Hopscotch Music Festival. The group's first live album Subminiature was released on Valentine's Day of 2025. Their latest release Ghost Bridge is slated for release October 2026. 

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Under his name, he has released five songwriter releases (Days Like Pearls, M-F, More Light!!, Anything Can Be Left Behind, and Proof Enough EP) and two collections of instrumental music (Heard From the Next Room and Brief Hold EP).  He performs this music as a duo with Margaux Bouchegnies. 

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Additionally, Cormier-O'Leary is the drummer and founding member of the indie rock band Friendship, and also performs live with power pop outfit 2nd Grade and Japanese folk legend Sachiko Kanenobu. In 2019, he founded Dear Life Records as a home for both his compositional and songwriter material. The label has since grown into a vast network of forward thinking, genre-bending artists including MJ Lenderman, Fust, Florry, Kath Bloom, Wendy Eisenberg, and more.

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All works are registered with BMI and represented by Merge Publishing.