Lucy Moss is a British musical theatre composer, lyricist, writer and director. She co-created the musical SIX with Toby Marlow while both were studying at Cambridge.

Lucy Moss is a British musical theatre composer, lyricist, playwright and director, best known for co-creating the musical SIX with Toby Marlow. The two created the show in their final year at Cambridge and first staged it at the Edinburgh Festival Fringe in 2017. In 2022 Moss and Marlow won the Tony Award for Best Original Score, and as director of most SIX productions she became, at 26, the youngest woman to direct a Broadway musical.

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