Sienna Spiro is one of those rare artists whose voice stops you in your tracks. At only 20 years old, she wrote “Die On This Hill,” a song so emotionally rich and vocally compelling that it demands a closer look.
In this breakdown, we will explore the vocal techniques that give Sienna her signature sound, how she navigates the trickiest parts of her range, and what you can take from her performance to bring into your own singing.
Sienna Spiro’s Signature Sound
One of the first things you notice about Sienna is the slightly raspy, almost cracked quality woven through her tone. This comes in part from vocal nodules, which are small callus-like formations on the vocal folds. When the folds try to close, these little bumps prevent them from meeting cleanly, which creates that soft squeak or crackle you can hear in Die On This Hill.
While this contributes to her unique sound, it is worth remembering that nodules are not something you need to develop to sound like her. The good news is that this signature texture can be approximated through technique alone, without ever harming your voice.
Lowered Larynx and the Jazzy Quality of Die On This Hill
When Sienna sings lines like “tell me to stay,” she is working with a lowered larynx combined with open vocal folds. Dropping the larynx darkens the timbre and gives her that soulful, jazzy quality. Alongside the lowered larynx, you can hear a subtle drop at the back of the throat, and even a slight lowering of the soft palate, which acts like the doorway to the nasal cavity.
Key elements of this sound include:
- A lowered larynx to darken the tone
- Slight engagement of the tongue root
- A small drop of the soft palate
- Open, relaxed vocal folds
These muscles always work together rather than in isolation, which is why the sound feels so organic on tracks like Die On This Hill.
Subglottic Pressure and Thicker Vocal Fold Contact in Sienna’s Voice
Because nodules prevent the vocal folds from closing easily, Sienna often uses more back pressure beneath the folds to push them into firmer contact. You can actually see this in her body when she sings.
There is a subtle lift in the shoulders and an increase in overall physical energy as she pushes through more demanding phrases. This thicker vocal fold contact is what allows her to cut through with power in certain sections, overcoming the interference of the nodules and giving lines in Die On This Hill their grounded, full-bodied punch.
Falsetto and the Stiff Vocal Fold
In softer moments, Sienna slips into falsetto, where the vocal folds become stiff rather than thickened. Because the folds are stiff, they stay slightly open at the back, which lets a little air escape and creates that breathy, airy quality.
It is not about pushing air through the sound. It is about the stiffness itself. If you want to recreate this in Die On This Hill, pull back the volume and move closer to the microphone so the intimacy of the tone translates clearly on the recording.
Thyroid Tilt and the Moan in Sienna Spiro’s Sound
When Sienna hits “I’ll take my pride” and reaches up to a C sharp 5, you can hear a distinct moan in her tone. This is thyroid tilt in action. Thyroid tilt is what gives high notes that sad, yearning quality, and it makes emotional singing feel effortless rather than forced. For most singers, a C sharp 5 sits high in chest voice, so thyroid tilt becomes essential for reaching those notes with the emotion intact.
Mixed Voice and Navigating the Passaggio in Die On This Hill
Sienna demonstrates beautiful mixed voice work throughout the song. Mixed voice is essentially the ability to carry chest voice further up into the range while letting the vocal folds gradually thin as the pitch rises. This is especially important when navigating the passaggio, which is the bridge area between chest voice and head voice.
Some coaches call this the Bermuda Triangle of the voice, because it is where singers tend to lose their footing. Sienna handles this transition with grace, often using a glottal onset to land in a thicker vocal fold position, which reduces the breathiness and crackle in her sound.
Vibrato and Vocal Coordination
The vibrato in Die On This Hill sometimes tries to emerge but cannot always settle into a steady stream. That is because vibrato relies on good vocal fold closure and a balanced breath flow against the folds. Vibrato is not something you create. It is something you allow to manifest through proper coordination of all the muscles involved, and it takes dedicated training to get there.
Things to know about developing vibrato:
- It requires consistent vocal fold closure
- It depends on balanced airflow against the folds
- It cannot be forced or faked effectively
- It emerges naturally from well-coordinated technique
Darkening the Sound on Higher Notes
Toward the end of Die On This Hill, Sienna reaches up to an E flat 5. What is remarkable is that the note does not sound as high as it actually is. Part of this is down to larynx size, but she also drops her larynx slightly on the way up, darkening the timbre and giving the note that jazzy quality. Lowering the back of the tongue adds to this effect, creating a richer, more grounded sound at the top of her range.
The X Factor: Making Die On This Hill Your Own
The biggest lesson from Sienna Spiro is not any single technique. It is emotional commitment. She means every word she sings, and that authenticity is what makes her performance impossible to look away from. When learning Die On This Hill, use the techniques as a guide, but do not try to create a carbon copy of her voice.
Many of her signature sounds come from her specific vocal condition and her personal artistic choices. Your voice, your story, and your emotional truth are what will make your version land.
Things to keep in mind:
- Listen and mimic to learn the techniques
- Bring your own lived experience into the performance
- Let your emotional honesty color the sound
- Make choices that fit your voice, not someone else’s
Sienna Spiro is proof that technique and feeling together are what create an unforgettable performance. Die On This Hill is a stunning showcase of both, and there is so much to learn from it, whether you are drawn to her jazzy lowered larynx, her thyroid-tilted highs, or the raw emotion that carries every phrase.
If you want to learn more about how you can learn to implement these singing techniques into your own voice, let’s sit down for a chat and discuss if the vocal academy is the right fit for you. You can join us here.