16 songs you probably didn't know were written or produced by Billie Eilish's brother Finneas

Billie Eilish and Finneas O'Connell are siblings, best friends, and close collaborators.Frederic J. Brown/AFP via Getty Images

• Finneas O'Connell is a 22-year-old singer, songwriter, producer, and five-time Grammy Award winner.
• He is best known for working with his younger sister, Billie Eilish, and producing her No. 1 debut album.
• O'Connell goes by the mononym FINNEAS as a solo artist and released his debut EP, "Blood Harmony," in October 2019.
• He has cowritten or coproduced songs for Selena Gomez ("Lose You to Love Me"), Halsey ("I Hate Everybody"), Camila Cabello ("Used to This"), and Tove Lo ("Bikini Porn").
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You probably know Finneas O'Connell for working with his younger sister, Billie Eilish — but that might be because you're not paying close attention.

True, O'Connell has cowritten and produced every song that Eilish has ever released, from her debut EP "Don't Smile at Me" to her James Bond theme song "No Time to Die." But the 22-year-old singer, songwriter, producer, and five-time Grammy Award winner has far more than "the Billie sound" on his resume.

O'Connell goes by the mononym FINNEAS as a solo artist and released his debut EP, "Blood Harmony," in October 2019. He's also become a scalding hot commodity in pop music. He's chameleonic, with a goal to "get out of the way" and execute other artists' visions, and has done so with pop heavyweights like Selena Gomez, Camila Cabello, Halsey, and Tove Lo.

Keep reading for a list of songs that O'Connell had a hand in creating, whether you realized it or not.