F.T. Island’s Vocal Analysis: Lee Hongki

Vocal Range

A2 ~ A5 (3 Octaves)

Supported Range

C3 ~ G#4/A4

Voice Type



  • Consistency in mixed voice and resonance is very good up until A4
  • Generally sings with very good pitch
  • Lower range has connection, support and control down to C3
  • Nasality is almost never present in his singing
  • Falsetto is generally in pitch when used
  • Generally sings in a range that’s within his supported range
  • Strongest vocalist in FT Island
  • Musicianship is present, generally changes songs to fit his voice
  • Controls and produces a healthy vibrato

Points for Improvement

  • Falsetto is not often used and seems to be an under explored and under developed register
  • Notes above A4 are generally strained with a throaty chesty mix
  • Mixed voice is generally more on the chest-dominant side, causing more strain as he ascends in pitch
  • Pitch can be flat when singing outside of his supported range due to poor support
  • Notes below D3 are generally quiet and poorly supported
  • Although stylistic, tension can often be too present in his singing
  • Due to lack of warming up or fatigue, throaty moments can happen with his singing


  • Lower register: Somewhat developed in placement but not nearly as well explored as one would desire. Hongki’s lower range is consistently supported from D3 ~ E3 and he has shown the ability to support even as low as C3. Notes below C3, however, become more airy and are hit with the help of the vocal fry register due to lack of development in his lower range.
  • Mixed register: A very consistent part of his voice, where he’s able to keep resonance, good support and placement from the bottom of his mix to even as high as G4/G#4 consistently and is able to stretch that into support and resonance on A4’s. Above A4, however, the mix doesn’t lighten up causing strain in his voice.
  • Upper register: His least explored register by far is his falsetto. It is safe to assume that he can transition into this register in the higher 4th octave with enough ease to keep stable pitch, but the few times he has gone up into the fifth octave were mostly with an airy falsetto in studio.


As a rock singer, Lee Hongki shows little to no interest in developing agility in his voice. Due to the heavier technique used to sing rock music, where he relies on a chestier mix and more volume, he tends to lose the flexibility existent in the outer parts of the vocal cords that help creating a lighter mix and also a more agile voice. The few times he has done any kinds of slight jumps in vocal melodies, such as in “사랑사랑사랑”, his pitch is mostly fine and his runs generally are quite slow. It is not particularly necessary for him to develop such an ability as a rock singer, but it could be something to be looked into if he has the interest to expand into more genres of music in the future.

Overall analysis

One of Korea’s mid-generation idols and one of the first idols to break into the band music scene, FT Island’s Lee Hongki is also very well known for his unique tone and his singing skills. The tone of his voice is very light and boyish in nature, and yet possessing a husky manly quality to it as he ascends in pitch or adds intensity to his singing. The overall natural tessitura of his voice lie closer to that of a tenor, more likely falling into the Light Lyric fach.

When it comes to his lower range, FT Island’s music is often written for their specific vocal ranges and even by the members themselves. As such, most of the songs often fall in between the D3 ~ A4 range, sometimes peaking at B2 to B4, thus not allowing for much to be shown when it comes to support and development of registers. Having said that, however, Hongki has shown enough times through his more acoustic performances that he is capable of comfortably supporting his voice consistently as low as E3, such as in “I Confess“, D3 in “미치도록” and “Words I Haven’t Said“, and even more recently showing the ability to consistently produce audible, supported and well placed, comfortable C3’s, such as in his performance in the “Vampire Musical” as well as an acoustic cover of “다행이다“. giving the idea of airiness being a stylistic choice more so than lack of development, as well as indicating recent improvement in his lower range. As he descends below C3, however, the tone of his voice is usually lost to a more airy tone and his vocal cords lose the connection they have above that, as well as his support starting to become more shallow, such as in the B2’s of “미치도록” and A2’s from “빛”, where he heavily relies on a more vocal fry-like tone to let the notes come out.

As Lee Hongki ascends into his mixed range, his voice becomes more piercing and more intense, opting for a darker tone with a heavier use of chest voice in his mix. The heaviness is mostly due to the chest-dominant mix he uses, as opposed to him having that dark of a tone. His voice is generally very consistent in support in his mix, producing effortless resonance from F4 ~ A4. He has shown numerous times that he is able to sustain G4’s with resonance, such as in “내사랑내곁에” and”사랑사랑사랑“, G#4’s, such as in “청혼“, “그대는인형처럼웃고있지만” and “사랑앓이“, and A4’s such as in “말리꽃“, “모두다사랑하리“, “고해” and “신사동그사람“. Even though his placement is quite pleasant and so is his support, the result of a chest-dominant mix can be that at times fatigue can cause his condition to change quite easily and for his range to be affected. At times Lee Hongki might fall flat when trying to sing above A4, due to the lack of head voice in his mixed voice, such as the Bb4’s in “좋겠어” and “바래“. At other times, even in better condition, the strain in his voice becomes apparent above A4 due to the heaviness of tone, causing Hongki to rely a lot on his throat and having a high larynx on higher belts, such as the B4’s in “신사동그사람“, “PRAY” or the C5’s in “태양을피하는방법” and “조조할인“. Even though, he does still show characteristics of a tenor by being able to push his voice to mix as high as Eb5, while singing “지독하게“, even with a heavy chest-muscle coordination. Another downside of his mix, as well, lies within his stylistic choice of purposely tensing up his voice with heaviness of rock singing, which can cause his voice to sound throaty and slightly tense, such as in “사랑앓이 (Different Performance)” and “고해“.

The highest register Hongki has shown is his falsetto register. As opposed to the rest of his voice, this register is not nearly as used nor as explored, which can be due to the fact that he is not as confident using this register live, as well as it not fully fitting the style of music he usually sings. In the original version of “태양을피하는방법“, Rain sings a full tone below Hongki’s key and switches into falsetto on a Bb4, whereas in Hongki’s cover, he chooses to belt the C5 instead of switching. The few times he’s switched live, he shows less projection and the sound of his voice becomes clearly more airy and less well placed, creating a disconnected falsetto instead of a full sounding head voice, such as the A4 in “조조할인” and the G4 in “이젠남이야“. The few times his voice can gone above the fourth octave were the C#5’s and D5’s of “미치도록“, which he avoids live and the A5 in the studio version of “사랑사랑사랑”, where there’s a clear need for a push of air causing strain in his voice and showing a lot of tension, which can also validate the theory that his voice just isn’t as comfortable in his falsetto register as it is in the rest of his range.

Musically speaking, he has a very sensitive ear to music and is able to perform quite well within the rock-pop genre of music, using the right degree of airiness, throatiness, resonance, dynamics and knowing exactly when to be soft, quiet and whisper-like, or when to really give all his power to further emphasize the full content of the music he sings, to better deliver his vocal performances. For the most part, Hongki shows not only consistency in tone produce, a consistent column of sound, support and pitch, but also he shows many times the ability to use vibrato with a healthy natural vibrato, and the ability to control that vibrato, choosing when to add it and when not to have it in his singing. As he ascends above his supported range, however, his vibrato becomes generally unsteady, uneven and tense.

As a performer, idol, vocalist and entertainer, Lee Hongki has always shown professionalism and a passion for what he does. Not only has he consistently been able to sing better as the years passed, he always delivers good performances, knowing how to use the stage and how to act out the best he can on stage. As a vocalist, however, Lee Hongki’s main priority would be further developing the rest of his chest voice into his lower extremes, as well as learning better mixing technique to become even more versatile in his upper range, as well as exploring the rest of his falsetto range.


Although for the most part Hongki generally stays in the original melody lines of songs, he has the ear to further embellish his songs by playing around more so with the rhythmic approach of the vocal delivery, than the melodic approach. Even then, Hongki has shown a couple of times the ability to change his songs around, even if subtle in changes, he does have the sensibility to add to the music, as well as changing parts of the melody to better fit the condition of his voice in the day of the performance, examples including the acoustic versions of “사랑사랑사랑” and “미치도록“.

Label (Type of Vocalist)

MB Vocalists: Mid-Range Belters

ML Vocalists: Mid-Low Range Vocalists

Vocal Range Video(s)

coming soon

Best Vocal Performances


Analyzed by Ahmin (Kitsunemale)


306 thoughts on “F.T. Island’s Vocal Analysis: Lee Hongki

      1. He chose a good key for his voice, he is mixing up to A4 only. He sounds generally very good, he is keeping the same vocal quality that I know for him. A bit pushed and chesty, a bit raspy but the support is there when he wants it, so is the resonant.


      2. Honestly I think he was singing with a shouty high larynx the whole time, so I don’t get why he won. It was probably cause his performance was exciting.


  1. Hi Ahmin, huge fan of the blog, and diehard Primadonna here. They just recently came out with their 10th anniversary album and comeback! I’ve heard however that Hongki isn’t in the best health, and is nursing a ganglion cyst. I’m sure it’s affecting his singing, but I’m faaar from an expert. Is there any chance that you’d have a free second to listen to the bridge at very end of this performance? I’ll link to the timestamp directly: https://youtu.be/i_02nMV_OEA?t=3m40s

    Thank you for all your hard work! 🙂

    Liked by 1 person

    1. Hi dear! Actually someone asked about that earlier today. It’s better than I’d expect of him for Bb4 and C5 tbh.


      1. i was shocked at first when i saw C6 LOL i was like hmm one day he admitted he can’t really sing in his head voice and now a C6 , even with his cyst he still managed to keep relatively good placement he was so worried for that (Bb4 – C5)


      2. That’s great to hear, thanks for your response. It seems all the work he puts into keeping his vocal health in check really do pay off, and as a long-time fan, that’s relieving. Cheers!


  2. 2 weeks after mentioning his head voice 4:03 very RARE moment of live falsetto, on a funny note 1:38 when you know someone gonna murder your song and try to search for a mic to save it lol


  3. Hi admin, can you do a vocal analysis for Jaejin ? I just found out he supposed to be the lead singer of FTISLAND before Hongki came into the picture. Funny story, Hongki destroyed him at karaoke session during their predebut days with Park Hwan Kyu song’s A Thousand Years Love lol

    Liked by 1 person

    1. ahhh my bias. I wish I could find someone who would do a vocal analysis for him :/ I LOVE his tone so. friggin. much. I don’t know much about vocal technique, but he seems to have pretty good control over his voice (he doesn’t do shouty notes but can still give out really nice strong ones).


  4. I really love Hong Ki I think he is a rather underrated artist. Have you taken a listen to his latest single, Insensible?

    There is this shouty note that he does around 4;34 , what do you call that kind of a note? I’m sorry I’m really a novice in this matter but he does it without much strain but yet there that shoutiness.


    1. Well what do I mean what do I call that kind of note? Do you mean the quality or the pitch? The pitch would be bB4. I hear throatiness throughout that part up to 4:40 with adlibs as well.


      1. Well not shouting it would be a start. The note is high, but it doesn’t have to be shouty. If you sing it and you’re shouty, throatiness and strain will happen.


  5. “Due to lack of warming up or fatigue, throaty moments can happen with his singing”
    LMAO As a Pri I can tell you that this is probably from his constant drinking and showing up hungover to perform. He warms up, but that can only do so much.

    Liked by 1 person

  6. Hi!! FTISLAND just released a preview for their new Japanese single and there’s a song that blew my mind because Hongki songs a freaking D5 with a clean head voice, resonance and all. I was like, wait what? I’ve never heard him sing like that!
    Anyways, I may be wrong so could you listen to this please? ^^

    Of course, we don’t know yet if he’ll sing this live… hahah


    1. Woo dangerous thing to say, resonance and all. This had barely any connection. You probably should listen to more examples of male and female head voice with proper connection, support and finally resonance. This was tight, squeezed, the larynx was high but he was venturing into a register he barely ever uses and it’s one of the first times I hear him even attempting this so props to him for stepping out of his comfort zone! But it’s tight, it’s not developed at all, it’s very mixed voice like, there’s no support and it’s not very clean. It’s fairly husky and scratchy actually. It’s like he was having issues not mixing for that and it’s something he’s gotta get used to to get into his head register more smoothly. I hope I’m not coming off as mean, I’m not trying to be. It’s just dangerous to say stuff like that cause then people will start thinking it’s true.


      1. Thanks Ahmin! You’re right, I should be more careful. I got excited so I thought that was resonance because of the vibrato but I totally see what you mean now. It’s falsetto, not head voice! Still, that’s good news. It means he’s exploring a style he had given up onto. Hopefully he develops the right technique so he stays healthy ^^

        Liked by 1 person

  7. Hi ahmin 😀

    I know you guys are relly busy but can you finish hong ki vocal range video 😀
    It has been 2 years since you guys did the analysis .
    I still wait to see it ( sorry for my bad english 😀 )

    Liked by 1 person

  8. I come to Hongki’s analysis again after 4 years. Reading past comments about him being under appreciated gives me weird feelings because in these 2 years his live performances from radio and TV broadcast are mostly well received. His youtube singing clips also gain quite number of viewers, his image is better than ever. I’m happy for Hongki lol


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