Billie Eilish

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   Eilish possesses a soprano vocal range. Avery Stone of Noisey described her vocals as "ethereal" and Maura Johnston of Rolling Stone characterized them as "whispery". Doreen St. FĂ©lix of The New Yorker opined that she has a "husky, slurring voice that she can thin out to reedy". Music critic Robert Christgau wrote that while Eilish is musically and commercially pop, her brand also "reminds us how amorphous pop has become", describing her soprano as "too diminutive for vocal calisthenics", adding that her "playful version of teen-goth angst" and "electro-saturated debut album" captivated a diverse audience.
  Billie's brother, Finneas, collaborates on songwriting. He writes for her albums, produces her music, and also
performs in live shows. Eilish and Finneas like to ''completely make up things and become characters" and "have songs that are really fictional". Billie said a number of the songs also derive from her and Finneas' experiences. They try to write "really interesting and conversational" lyrics: "We try to say stuff that doesn't have to be that deep, but you say something way deeper in a certain way that makes sense, but you haven't really thought about it. "Finneas has stated when he writes songs for his sister, he aims to write songs that he thinks she'll relate to and enjoy singing and empathise with the lyrics and make them her own". When he writes with Eilish, he tries to help her tell whatever story she's trying to tell, bounce ideas off of her, listen to her ideas and use a language that fits her voice telling the story.

(information - Wikipedia)
Billie and Finneas performing ''Billie Bossa Nova''