VIXX’s Vocal Analysis: Leo


Vocal Range

B2 – E6 (3 octaves, 2 notes and 1 semitone)

Supported Range


Voice Type

Light Lyric Tenor


  • Able to sing with a somewhat clean legato
  • Registers are somewhat equal in development
  • Able to “project” due to correct jaw position
  • Transitions into falsetto can be within the same key
  • Able to sing through songs with most of the pitch correct


  • Support is absent from his voice entirely
  • Placement tends to cause issues with pitch outside of his mix
  • Never sings with a lifted soft palate
  • Singing is generally very throat based
  • The larynx is almost never neutral
  • Unable to mix without pushing the voice out with volume instead
  • Falsetto is generally airy and shows big contrast in volume compared to the rest of the voice
  • Chest voice is very airy and lacks projection
  • Every register is accompanied by shallowness and airiness in tone
  • Bad diction is present causing his throat to sound closed


  • Lower register: One of Leo’s least showcased registers. Even around F#3/G3 notes are usually unsupported, airy, and accompanied by a non-neutral larynx.
  • Mixed register: Leo’s most showcased register. Notes in this register are often throat based and placed in his nose the whole way up with his larynx starting to rise around E4.
  • Upper register: Debatably Leo’s least showcased register. A throat based, nasal, overly airy falsetto that is barely truly used.


Leo is no stranger to this aspect of his voice, often adding runs to songs. Despite this, Leo’s runs are never done with any precision or accuracy causing them to come out sloppy or done with no true thought for the melody. The result is thus vocal lines that become too soft and quiet in tone quality and volume, where the pitch is not defined and the runs sound more like slides. He is unable to sing runs with any sort of separation in pitch from note to note, instead opting to wander around the center of the pitch sliding from one note to the other without a direction, as heard in “Because Of You“, “그리워 그리워“, “I Miss You So Much” and “B.O.D.Y.”

Overall analysis

One of VIXX’s two main vocalists, Leo is often praised for his high notes and “strong, stable” voice. Gifted with a voice that’s got a lot of potential both in range and tone quality, he is able to handle singing very difficult vocal lines even prior to training. He’s always shown that his voice is naturally high and as a very light tenor, he’s able to continuously sing in a high range despite not having proper breath support. Regardless of that though, he’s been able to showcase a range of full 3 octaves which show how much potential his instrument naturally has.

Starting from his lower register, Leo has shown an extreme lack of development here with notes even as high for a male like him like F#3 and G3 lacking any actual support. Instead these notes are airy, placed in his nose, and a non-neutral larynx position all the way down to B2. Leo’s issues may be attributed to the fact that he seems to have a rather shy personality which comes off in both his speech and his singing. As such, he tends to whisper a lot when speaking instead of using his thyroarytenoid muscles in his vocal cords. This results in Leo lacking any presence of an actual chest voice, which causes his voice to be very soft and airy throughout the whole third octave from C3 to B3. This can be heard in the Eb3’s in “My Everything”, and “뒷모습“, C#3 in “차가운 밤에” and “I Don’t Want to be an Idol.” Adding onto this, he not only sings with a high larynx, but the airiness and soft tone he uses to speak also cause him to speak with a high larynx. This translates into his singing where he whispers a lot of his chest voice with a high larynx and then pushes it down in order to create tone due to the lack of development of his chest voice, as heard in the Eb3 and B2 in his musical performance of “Matahari.” The final product of this lack of development is a full of octave of his voice where there’s barely any true tone or color that can be heard.

Leo’s mix also shows a lack of true development: being throat based even before his first passagio with his larynx already shooting up even before E4. Throughout his mixed voice, due to lack of development of a chest voice, he tends to sing with a very bright tone and with a lot of lightness throughout. So in order to create more volume in his mixed voice, he compresses his throat around his larynx to force out more sound with unhealthy tension. As he ascends he begins to push and yell his notes, but due to singing with correct jaw positioning these notes are “projected” instead of being trapped in his throat and nose as seen in his A4’s in “Beautiful Liar“, “대준돼“, “To Heaven” and “I Don’t Want to be an Idol“, is Bb4’s in “Mirotic“, “Love Letter“, “Secret Night“, and “Outlaws Of Love“, his B4’s in “Please“, “Voodoo Doll (live radio)“, “청춘이 아파“, “마지막 승부“and “G.R.8.U.”  (and the live picnic version), his C5’s in “Eternity“, “Light Me Up” and “Error“, his C#5’s in “Mirotic” and “Love Letter“, his D5 in “Chained Up“, and his Eb5 in “Spider.” Another issue that he faces in this range is the use of a larynx vibrato that causes a tense, almost painful sound in his belts.

The issue of compression in his mixed voice isn’t present only in his higher notes, but can happen even in the lower part of his range. In order to compensate for the lack of volume, he’ll use a lot of throat tension to push his voice out and that causes him to not sound relaxed or in control of his voice. Instead he sounds shouty and his overall tone lacks roundness. His voice for the most part just sounds very constricted and tense, showing that there’s no real point in his mixed voice range where he’s able to sing without tension or by being relaxed. This can be heard in the Eb4 in “Please“, E4 in “Matahari“, F4 in “Words to Say“, F#4 in “G.R.8.U.“, and the G4’s in “이별공식.” Not only that, but even when singing in a lower range he tends to sing the most closed version of vowels, being unable to place his voice anywhere but his nose. He tends not to open his mouth much and use very closed throat shaping when singing softer which cause his voice to sound very muffled.

Leo’s falsetto is barely explored, when used it is usually nasal and throat based. Due to Leo’s unhealthy placement, he tends to often drift off the center of pitch and go flat even on basic phrasing as heard in “Snowflower.” On one hand, he is able to transition into his falsetto quite easily and most of the time his transitions stay within the original key center of songs, but due to the excessive airiness in his voice he’s unable to find the center of pitch when singing in his falsetto. This can be heard in “청춘이 아파“, “Secret Night“, “Love Letter” and “눈물이 뚝뚝 .” Since he does not connect his vocal cords properly, he’s been unable to develop the correct muscle coordination and strength to produce more volume and dynamics in his upper register. Thus he’s only able to sing with a falsetto and has never shown the ability to sing with a head voice. As he reaches his higher range further into the fifth octave and up to the sixth octave, his falsetto becomes a lot more strangled and squeezed, being very thin in tone as heard in the High Note Battle between VIXX, BtoB and MYNAME.

Throughout his whole range, musically speaking, Leo fails to deliver songs with any sort of true connection simply due to the fact that he is unable to sing with a good sense of dynamics. When he sings, most of the time even in the fourth octave, he tends to opt for an airy and raspy tone, which is very quiet and can cause his vocal cords to become irritated overtime. The one other volume he goes for is a very loud push of air that he’ll go for in his mixed voice, so in between these two volumes there’s nothing. He’s unable to sing with any other type of dynamics that aren’t fortissimo or piano. He has shown improvement in his pitch overtime which may be due to confidence or simply using more of his vocal cords when singing, where he’s now able to sing songs with a more centered pitch throughout than earlier in his career. However before he debuted, in 2008, it is possible to hear that Leo used to sing with a more neutral larynx than he does now.

Despite his weaknesses, Leo is a vocalist who’s full of potential. Not a lot of untrained tenors can sing as high as he can and that is impressive in itself. He’s always had a very wide range where he’s able to sing, however without fine tuning there’s a good chance he could end up damaging his voice and not being able to sing the way he’s been used to anymore. In order to protect his voice and keep his career as a vocalist, going back to the basics and learning to first breathe properly for singing and then addressing issues with the development of his vocal cords and his speech would help him develop his singing much further if he’s able to find the right instructor who can help him better his overall vocal technique.


Leo tends to not approach music with a sense of creativity, tending to sing without any changes in dynamics and usually only adds high belts to his covers of songs. Leo’s main vocal aspect is adding high notes to his vocal performances. He doesn’t rely much on runs, changes in tone quality, changes in melodic parts of songs or rhythmic changes, relying mostly on singing as loudly and as high he can to show off that side of his voice.


Weak Vocalist

Vocal Range Video(s)

Video by: Mariel Ang

Best Vocal Performance(s)

Analyzed by Haruko


154 thoughts on “VIXX’s Vocal Analysis: Leo

  1. Hi ^^ I want to ask if, in this video, Hongbin is not supporting and I feel he doesn’t have a good diction or he is kinda nasal, right?… I’m trying to understand those concepts and baritones are difficult to analyze for me (I thought BTS Taehyung and Hwanhee were nasal):

    And another question, how do you solve the throaty problem? ’cause I think my voice is a lot in my throat, sometimes is uncomfortable and others it dries my throat a lot.


    1. I mean it’s not a live video but he doesn’t really drop his jaw much when he sings. There’s no support, just improper throaty singing, nasality and no support. So you’re right but you thought V was nasal? He is, yes. Hwanhee is not usually nasal.

      Throatiness is a bad habit causes from using the throat muscles to help the vocal cords artificially by forcing them to come together and stretch with tension instead of naturally moving and stretching on their own without tension when they’re relaxed. So the way to fix that is to teach yourself to sing softly, with tone, no airiness, no pushing of air, no tension. To sing lightly, with connected tone and with no muscles being overworked. To know you’re doing it right or wrong, you need to hear someone doing it right and emulate them, as well as having them help you fix yourself by addressing minimal details.

      Liked by 1 person

      1. Thank you so much ^_^. I think I was pushing too much air so now I’m going to practice with your advices (I’ve already tried with them and it feels better, I was really tense in my throat and I unconsciously tried to use chest voice, bad habits are difficult to correct :D) and try to improve my head voice.

        As for the analysis on the video and the nasality, I need to practice more to identify those topics properly. Anyways, thank you very much for your answer, it REALLY helps me a lot. Have a good day 🙂 .

        Liked by 1 person

    1. G5 to C5, he has support there? If he can’t support Eb3 ~ Eb4, there’s absolutely no way he could somehow find support that high. He has no support, he is slightly better than Henry sure but that doesn’t mean he’s able to support.


  2. Hello! Thanks for the detailed analysis, really love this website. Excited for the upcoming analysis for Day6’s Sungjin. I’ve read the rules and I know you guys won’t be analysing rappers, but I wanted to know if you’d be doing analysis for any of the other members in the group? For instance, Young K and Jae rap but are also vocalists at the same time, and day6 has plenty of live, acoustic performances which could be used as really good material for analysis in my opinion. Interested to know how’d you rank and analyse their vocals because they all have very different styles/techniques in my opinion. Thank you!


    1. Hi there! ^ ^ Thank you for your compliment! Well you see, the rules aren’t restricted to rappers alone, we also make rules so that we don’t wast time analyzing vocalists who have a fairly similar amount of skill within the same group, so that would be another reason we may not analyze any other members of Day6. Actually as of now, the member of Day6 to be analyzed could very well change, everything could change. We are just waiting on more material, more information to appear as well. ^ ^ They do have somewhat different styles, but technique wise the average skill level is fairly similar from what I’ve noticed. But anything could change when we do get to 2015 debuts. ^ ^


    1. Not exactly. It’s possible, but being part of a musical could help him vocally ONLY if he receives actual vocal lessons. There’s a myth that if you do musicals, you’ll improve but if you’re not being taught to fix bad vocal habits, there’s absolutely no way to improve automatically like that. He would need an instructor.


      1. Idk if he’s improved any, but hopefully appearing on singing shows will encourage him to improve/get lessons or something –> tends to happen to other idols.

        How does he do here?
        this is his first time on duet song festival, i think I see the same problems with Leo but he’s less breathier than normal at least?


      2. There’s no real change in the way he is singing, he may be using less airiness stylistically but he is still not supporting his voice at all.


      1. Ah well I mean on this site, considering he and Henry have the least technique haha. I find his voice pleasant enough as a singer tho. 😛
        And thank you for the answer!

        Liked by 1 person

  3. Hi. This Hongbin’s cover of Save Room by John Legend. Do you hear any sense of support, shallow? How was his mixing here? It sounds bright and quite balance for me. What are his issues in this cover?

    Another question: How would you rank them techinically in their technique? Given that Ken is the strongest.



    1. I hear no real support, it’s just off of his throat. He’s singing without support, it’s shallow. He barely mixed, I don’t know where you’re hearing that he’s balanced but he was only singing as high as Bb3, which for a baritone isn’t mixed yet. He mixed at the end with the Eb4 and C#4 I think, which was very chesty actually. I wouldn’t rank them amongst weak vocalist since I don’t know them well enough to separate them. Where did you think he mixed?


  4. Hi Ahmin! It’s me again. Hahaha. Simple question: if you would be generous enough. What would be Leo’s supported rAnge?? I guess its G#3 – Eb4?


  5. Hi! So to be completely honest I have no idea what I’m talking about or listening for regarding vocal technique (although I’m slowly learning through these analyses among other things), and I was wondering what you thought of Leo’s high note at 3:28 in this Beautiful Liar performance: It sounded much more open and clear than I can remember him ever singing live and certainly better than the rest of the song. Then again it could just be nothing, so I’d love to hear your thoughts. Thank you!


    1. It’s very shouty. It sounds like the usual way where he approaches notes by singing with a high larynx and a lot of volume and overly opening his mouth so the sound comes out as loud as he can push it out.


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