When Billie Eilish broke onto the alt-pop scene as an angsty outsider-turned-icon—a moment captured in her 2017 Apple Music Up Next documentary—her brother FINNEAS was just a few feet away, having co-written all of the songs from her blockbuster debut WHEN WE ALL FALL ASLEEP, WHERE DO WE GO?. Now, the 22-year-old singer-songwriter is stepping into the spotlight with his own debut EP, Blood Harmony. The title refers to the term used to describe the vocal chemistry of siblings who sing together, and yet the two artists’ styles are remarkably different. Unlike Eilish’s warped electronics and goth-pop sensibility, FINNEAS specializes in upbeat guitar songs: They’re earnest, clean, buoyant, and optimistic, lit by the LA sun. Even the closing track “Die Alone” somehow feels promising and romantic. That both siblings arrived with such distinct and fully formed identities—one anti-pop star, one pop-rock hopeful—is a testament to the strength of their independent creative visions. For a taste, listen to “I Don’t Miss You at All,” a chipper, strummy breakup cut that bundles heartache in hope.