How to Sing Like Hayoung (fromis_9): Belting Power & the Technique Behind It

Singing like Hayoung is less about a naturally high voice and more about two trainable skills: steady breath support that carries power into the upper register, and a controlled passage into head voice that lets her reach A5–A6 territory on songs like "DM" without strain. Once you separate those mechanics from the sound itself, her style becomes something you can build toward, regardless of your starting voice type.

Safety note: None of the techniques here should cause throat soreness, a pressed feeling in the larynx, or hoarseness lasting beyond 24 hours. High, powerful notes are produced through breath support and registration, not by forcing chest voice upward or squeezing the throat. If you feel strain, reduce volume and rest. Consult an ENT specialist for hoarseness lasting more than two weeks.

Hayoung's Vocal Profile

Hayoung is the sub-captain, main vocalist, and main dancer of fromis_9. A single, independently verified vocal range is not consistently documented across sources, but two reference points are well established: dedicated live-vocal analysis of "DM" (2022) shows her comfortably reaching into the A5–A6 area, including whistle-register moments, and her cover of "Santa Tell Me" shows a sustained full-voice note around A5. Her range also sits notably higher than fellow main vocalist Jiwon's in the group's shared highlight sections.

A note on accuracy: reported vocal ranges for any singer vary between sources and between live and studio takes, and Hayoung's classic voice-type classification (soprano, mezzo, etc.) is not established in available material — treat the figures above as approximate reference points rather than a fixed profile. It's more useful to study how she produces specific passages, which is what the rest of this guide focuses on.

Her stylistic signature centers on three things:

• Belting / high-note power — the ability to sustain a full, supported tone into the A5–A6 area during live performance rather than thinning out or switching to a light falsetto.
• Breath support — the steady airflow control that lets her maintain power and pitch across a wide range without losing tone quality.
• Tone color — a bright, cool, forward vocal placement that gives her highlight moments a distinct stage presence.

Hayoung's Signature Songs — by Vocal Challenge

Approaching her material by what it demands rather than by popularity gives you a training order. Transpose any of these to a key that fits your range.

Start at the top of the table and move down only as each technique becomes reliable. The "DM" finale is the destination, not the starting line.

The 3 Techniques Behind Hayoung's Sound

Belting / high-note power

Rather than switching to a thin, light falsetto on her highest passages, Hayoung sustains a full, supported tone up into the A5–A6 area during live performance. This is not simply "singing loud" — belting at that height requires precise coordination between breath pressure and vocal fold closure so the tone stays full without the throat tensing. The most common mistake when imitating this is pushing chest voice upward by force, which strains the voice instead of training it.

Breath support

The power behind her highlight sections is carried by steady, well-managed airflow rather than volume alone. Diaphragmatic breath support is what allows a phrase to stay in tune and in tone from the first note to the last, especially across a demanding song like "DM" performed live. Without that foundation, high notes lose pitch stability quickly — breath training has to come before attempting to match her tone.

Tone color

Her stage sound has a bright, cool, forward quality that gives highlight moments a distinct presence separate from raw loudness. This comes from resonance placement — where the sound is focused in the vocal tract — working together with breath support, rather than from volume alone. Developing a similarly focused, forward tone is a resonance-training skill, independent of natural voice type.

How to Train Toward Hayoung's Style

Step 1 — Find your comfortable key first

Run a range test from your lowest to highest comfortable note before attempting any fromis_9 song. Hayoung's live highlight sections sit high, but almost every track works transposed to fit your own voice. Singing in a fitting key prevents the strain that comes from chasing her exact pitches on day one.

Step 2 — Study the highlight moments, not just the melody

Pick one song and listen for where the vocal line is supported mid-range power versus where it climbs into the top register. Identify which technique a phrase actually requires — sustained power or a controlled climb into head voice — before you sing it. This turns imitation into a technical target instead of a general impression.

Step 3 — Build breath support before chasing the top notes

Her power at the top of the range depends on steady, well-supported airflow, not volume alone. Train diaphragmatic breath support so you can hold pitch and tone through a full phrase before adding intensity. Pitch instability on high notes almost always traces back to breath support, not the high note itself.

Step 4 — Train the passage into head voice and the upper register

Her highest live moments — including whistle-register passages in "DM" — require a smooth, controlled climb from chest through mix into head voice, not pushed chest volume. Work register-transition drills at moderate volume so the coordination is trained before power is added. This is the exact mechanism behind reaching the A5–A6 area without strain.

Step 5 — Run an AI feedback loop on a single phrase

Choose one 8-bar passage, record it, and use Bloom Vocal's AI coaching to score pitch accuracy, breath support, and register consistency. Compare playback to the original for registration first, tone second. The AI surfaces habits — like chest-pushing near the top of the range — that are difficult to detect by self-listening alone.

Check Your Cover with AI

Imitating a powerful, high-belting style by ear has a real ceiling: it's hard to hear your own pitch drift or breath support dropping out while you're singing. Upload a recording of a Hayoung passage — a highlight section of "Feel Good" or the climbing finale of "DM" — and Bloom Vocal's AI scores your pitch accuracy, breath support, register transitions, rhythm, and expression on a 1–5 rubric, then recommends the specific exercise to fix your weakest area first. It turns "that felt off" into "your support dropped out on the climb into the top register — drill breath control before the next attempt."

For a broader framework on how idol vocal styles map to trainable technique, see the K-pop idol vocal style analysis. A fellow fromis_9 member's guide covers a very different stylistic approach — falsetto-centered rather than belting — worth comparing if you're studying the group's overall vocal range.

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References

• Sadolin, C. (2000). Complete Vocal Technique. Shout Publishing. [Belting and full-voice production mechanics; breath pressure and vocal fold closure requirements for sustained high-register singing.]
• Titze, I. R., & Verdolini Abbott, K. (2012). Vocology: The Science and Practice of Voice Habilitation. National Center for Voice and Speech. [Breath support and subglottal pressure control across chest, mixed, and head register in high-pitch phonation.]