Billie Eilish is one of the most successful singer-songwriters working today.

On the eve of her second album, Happier Than Ever, the pop teen has already sold millions of records, won multiple Grammys, and recorded an iconic Bond song at just 18 years old – the youngest person ever to do so.

But how good is her voice, from a music analysis perspective? We go beyond the stardom and the slick production, and have a deep listen to Eilish’s isolated vocals in terms of tone, timbre, range and beyond.

Eilish’s tone is typically soft and gentle, with a lyrical quality. She has a strong sense of pitch, something you will have heard while she’s riffing with brother, Finneas, during the songwriting process in Billie Eilish: The World’s a Little Blurry documentary, if you watched it. Or in Eilish’s live and a cappella performances.

She sings in an expressive way, with some vibrato, but she never pushes it beyond her natural voice to ‘belt’ – which is when a singer carries their ‘chest’ voice above their break to really force the sound.

There’s relatively little in the way of contrast in terms of volume or tone colour, when you compare Eilish’s voice to that of a classically trained singer. But that’s mainly because that’s not what this music requires, and “little” doesn’t mean none. It’s all very subtle.

To really get into Eilish’s tone, start with ‘ocean eyes’, ‘everything i wanted’ and ‘i love you’, before having a close listen to ‘when the party’s over’.

Billie Eilish’s understated authentic pop style calls for a beautiful and fragile timbre. Her voice is typically breathy and wispy, but no less strong and sure.

Like her tone, she doesn’t stretch into big contrasts when it comes to the timbre, by which we mean the quality or the style, of her voice.

But have a listen to ‘bellyache’ and then ‘COPYCAT’ to hear the range of qualities Eilish’s voice does have. It’s not that of an operatic soprano, perhaps, but it’s always controlled. You’ll hear that it suits gentle, acoustic guitar-led moments – where it’s characterised by soft, muffled textures (opening verses in the former song) – just as well as it does an electronic club banger, where she drops the interference in favour of a smoother, stronger vocal that cuts through (the latter – which you can hear below).

Her voice is comparable to that of New Zealand teen pop sensation Lorde, and Norwegian singer-songwriter Aurora.

Billie Eilish’s voice is roughly around the mezzo-soprano range.

Using ‘COPYCAT’ as an example again, she does go right into the top soprano ranges very occasionally, but the song largely sits in that comfortable mezzo range during its chorus and the majority of the verses.

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