Modern pop architect Finneas O'Connell is best known for co-writing and producing tunes with his little sister, Billie Eilish—but she’s hardly his only collaborator. As a writer and producer, FINNEAS has a gift for range, whether crafting subdued pop ballads for artists like Ashe and Gabrielle Current, giving Rebecca “Friday” Black a dose of emotional depth or striking a balance between ethereal and crushingly bleak on his tracks with Billie. But no matter how much the Los Angeles-based artist brings to others' songs, he saves some of his most fun, upbeat bops for himself, packing them with singular wit, warmth and perspective.