How to Sing Like Martin of CORTIS: Style & 5-Step Guide
Study Martin of CORTIS through his group tracks and Lee Mujin Service covers. Practice rhythmic phrasing, breath pacing, and dynamic expression in your own key.
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To sing like Martin of CORTIS, study rhythmic phrasing, controlled breath, and dynamic changes; you do not need to copy his voice or assume an unverified vocal-range label. Use his group recordings and Lee Mujin Service covers as separate practice material, in a key that fits you.
Safety note: A useful practice take should not cause throat pain, a pressed feeling, or lasting hoarseness. Do not push chest voice upward to imitate a brighter phrase. Reduce volume or stop if your voice feels strained; consult an ENT specialist if hoarseness persists for more than two weeks.
Martin's Vocal Profile
Martin is a member of CORTIS, whose first EP, COLOR OUTSIDE THE LINES, credits all five members across the album. Martin described the group's shared writing and production in a Weverse Magazine interview. The tracks below are CORTIS group recordings, not Martin solo songs.
The sources here do not establish a reliable, complete measurement of Martin's personal vocal range. One performance cannot define a full range, and a cover may use a different key. Identify the passage's demands and transpose it to a comfortable key instead of trusting an unsourced range chart.
KSTATION TV describes Martin's Lee Mujin Service performance as soft, rhythmic, youthful in timbre, and dynamically expressive. These are the outlet's listening descriptions, not a formal voice-type diagnosis. Translate them into practice targets: lyric timing, phrase length, and intensity changes without extra throat effort.
Martin's CORTIS Tracks and Covers — by Vocal Challenge
Study the group arrangements separately from Martin's solo covers. Start with short rhythmic phrases, then move toward longer lines and wider dynamic changes; the hardest task is a destination, not a starting point.
| Recording | Context | Practice challenge | Build first |
|---|---|---|---|
| “GO!” | CORTIS group track | Crisp rhythmic syllables over a sparse, hip-hop-influenced beat | Speak-sing timing |
| “FaSHioN” | CORTIS group track | Clear consonants and rhythmic precision through energetic phrasing | Relaxed jaw and diction |
| “What You Want” | CORTIS group track | Balancing a rock-influenced melodic line with a grounded pulse | Breath pacing and beat awareness |
| “Lullaby” | CORTIS group track; also performed by Martin on Lee Mujin Service | Chant-like phrasing against a dreamier arrangement | Beat awareness and gentle dynamics |
| “Thinking Out Loud” | Martin's Lee Mujin Service cover | Longer lyrical phrases and connected vowels | Quiet, planned inhalations |
| “Nan Chun” (“Spring”) | Martin's Lee Mujin Service cover | Dynamic contrast and expressive phrase shaping | Consistent pitch at low volume |
The 3 Techniques Behind Martin's Style
Rhythmic phrasing and clear consonants
In groove-led singing, consonants set timing while vowels carry pitch. Speak the lyric against a slow metronome, then sing it on sustained vowels. A common mistake is biting consonants or racing through word endings; keep the jaw loose and let vowels carry the note. The verified B-17 (Rhythm Subdivision) exercise trains even timing inside the beat. For another K-pop example of rhythmic delivery, see the Jay Park singing guide.
Breath pacing for soft and sustained lines
Martin's Lee Mujin Service set included CORTIS's “Lullaby” and covers with longer lyrical phrases. Plan the breath before the line, then release air evenly as the vocal folds vibrate. Soft singing still needs stable breath support; a common mistake is leaking extra air until the pitch becomes less steady. The verified A-2 (Counted Breathing) exercise develops exhale control. The Woodz vocal-style guide offers another way to study phrasing and tone color separately.
Dynamic shaping and register coordination
KSTATION TV notes changes in expression across Martin's cover set. Practice that idea without guessing his register: sing at an easy volume, shape one word fuller, then return to a lighter sound. As pitch rises, the vocal folds and resonance coordinate across the passaggio; a common mistake is carrying heavy chest voice upward or squeezing for intensity. The verified C-3 (Mix Voice Foundation) exercise practices a gentle connection between chest and head voice. The Jonghyun vocal guide offers another song-based register example.
How to Train Toward Martin's Style
Step 1 — Choose a comfortable key
Pick a short line from a CORTIS recording or cover. Sing quietly and transpose until it feels manageable end to end. If the top feels pressed or low notes disappear, change keys rather than sacrificing coordination to match the recording.
Step 2 — Map the rhythm before singing
Listen for the pulse, then speak the lyric in time. Clap and mark which syllables land on or just before each beat. Sing the line on one easy vowel, then add consonants once the timing feels relaxed. This separates rhythm from the added demands of lyrics and pitch.
Step 3 — Practice breath pacing
Mark a phrase ending and choose a quiet place to inhale before it. Breathe comfortably without lifting the shoulders, then sing at a moderate volume. If you run out of air, shorten the phrase or lower the volume rather than tightening the neck.
Step 4 — Connect registers at easy volume
For a phrase that crosses registers, start with a light lip trill or hum, then add the lyric at the same volume. If the transition catches, simplify or transpose instead of pushing. See the Jonghyun vocal guide for another song-based register example.
Step 5 — Record and review one phrase
Record a short take and review timing, breath, register changes, and expression before judging timbre. Bloom Vocal's AI feedback can help review pitch accuracy, breath support, register transitions, rhythm, and expression. Choose one observation and repeat the phrase to compare.
Adjust the Practice to the Situation
| If you notice… | Try this |
|---|---|
| The lyric feels rushed | Speak it over a slower beat, then restore the recording tempo gradually |
| The phrase fades at the end | Plan a breath earlier or practice a shorter phrase |
| Consonants feel tight | Reduce volume and release the jaw between syllables |
| The register transition catches | Use a gentle hum or lip trill and transpose the phrase down |
| The soft line loses pitch | Use less air and keep the breath flow even |
| You feel throat discomfort | Stop, rest, and resume only when your voice feels comfortable |
Check Your Cover with AI
Record one short phrase from a CORTIS group track or Martin's Lee Mujin Service cover in a comfortable key. Use Bloom Vocal's AI feedback on pitch, breath support, register transitions, rhythm, and expression to choose one next drill. Compare the musical phrasing instead of trying to duplicate another singer's anatomy or exact tone.
References
- BIGHIT MUSIC. (2025). The 1st EP [COLOR OUTSIDE THE LINES]. Official album and track context, including group member credits and notes on “GO!,” “What You Want,” “FaSHioN,” “JoyRide,” and “Lullaby.” https://ibighit.com/legacy/cortis/color-outside-the-lines-en.html
- Weverse Magazine. (2025). MARTIN: “I have this strong desire to shake things up”. Interview on Martin's musical background and CORTIS's collaborative writing and production. https://magazine.weverse.io/article/view/1568?artist=CORTIS&lang=en
- KBS Kpop. (2025). Lee Mujin Service: MARTIN (CORTIS). Performance of “Lullaby” and four covers. https://www.youtube.com/watch?v=1neJU-a_0xk
- KSTATION TV. (2025). CORTIS: MARTIN showcases his voice and establishes himself firmly. Performance report and track set. https://kstationtv.com/2025/12/17/cortis-martin-showcases-his-voice-and-establishes-himself-firmly/?lang=en
- Titze, I. R. (2006). “Voice Training and Therapy With a Semi-Occluded Vocal Tract: Rationale and Scientific Underpinnings.” Journal of Speech, Language, and Hearing Research, 49(2), 448–459.
- Sadolin, C. (2000). Complete Vocal Technique. Shout Publishing.
How to Practice Martin of CORTIS's Vocal Style in 5 Steps
A gradual routine for studying phrasing, breath pacing, register coordination, and expression in Martin's recorded and televised performances.
Total time: PT30M
- 1
Choose a comfortable key
Sing a short phrase softly; transpose until it sits comfortably in your speaking-to-singing range.
- 2
Map the rhythm before singing
Speak the lyric in time, then clap the beat and mark syllables that lead or land on each pulse.
- 3
Practice breath pacing
Mark phrase endings; inhale quietly before them and keep airflow steady through each line.
- 4
Connect registers at easy volume
Hum or lip trill through the transition, then sing the vowel without adding throat pressure.
- 5
Record and review one phrase
Record one phrase and use AI feedback to review pitch, breath, register, rhythm, and expression.
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