Who is Finneas O’Connell, and how did he get five Grammy nominations? (Hint: Billie Eilish stans him)

Billie Eilish’s six Grammy nominations — including nods in all four major categories, the youngest act ever to do so — made history on their own. O’Connell, raised in Los Angeles’ Highland Park neighborhood with his sibling, had some success as an actor before his sister’s ascent, starring in the final season of “Glee” and landing a small role on “Modern Family.” But his work with Eilish, starting from “Ocean Eyes” up through her new single “Everything I Wanted,” defined his creative life and made him something like Drake’s producer Noah “40” Shebib for Gen Z — an instrumentalist whose clear and distinct work for one artist remade pop music. He told Rolling Stone, “If you play a lot of instruments in that range, her voice sounds foggy — but things like bass, kick drums, and low, clocky snares can co-exist and not conflict.” It’s a challenging sound for top 40, but the timing was clearly right for something testy and bracing — a whole class of singers like Clairo are following Eilish in melding electronic pop, R&B and emo melancholy. He co-produced “Lose You To Love Me,” the recent single for Eilish’s Interscope labelmate Selena Gomez, her first Hot 100 No. His October solo debut, “Blood Harmony” is a confident, crisply produced work that, while obviously forgoing his sister’s idiosyncratic star power, also makes a strong case for his own vision as a writer and producer.