Leeteuk’s—His singing voice sounds like a mixture of Heechul’s and Sungmin’s. He is a tenor.

Heechul’s—His singing voice sounds like a less controlled version of Leeteuk’s; more like his speaking voice. He is a tenor.

Han Geng’s—He has a bit of an accent when he sings in Korean but it sounds a lot like his speaking voice when he sings in Chinese. He is a tenor.

Yesung’s—He is a baritone who uses a fair amount of vibrato. Very passionate.

Kangin’s—His singing voice sounds like his speaking voice, very strong. He is a baritone.

Shindong’s—He’s a bass, meaning his voice is the deepest. He raps a fair amount as well.

Sungmin’s—His voice sounds like a younger version of Leeteuk’s. He is a tenor. Occasionally he will sound a bit like someone has stolen his cookie, a bit whiny.

Zhou Mi’s—His singing voice sounds a bit like his speaking voice. He is a tenor. He has a bit of “romance” in his voice when he sings.

Eunhyuk’s—His singing voice sounds like his speaking voice. He raps a good amount. He is a tenor.

Donghae’s—His singing voice sounds like his speaking voice. He is a tenor and raps occasionally. He sounds a bit nasal when he sings live DON’T HURT ME.

Siwon’s—His singing voices sounds like his speaking voice, a tiny bit “rough.” He is a baritone.

Ryeowook’s—He has the highest singing voice though he is a tenor rather than a falsetto like I thought.

Kibum’s—He has a strong voice. He is a bass. He raps occasionally.

Kyuhyun’s—He is a bass and uses a lot of vibrato when he sings, also very passionate.

Henry’s—He is a tenor with a very youthful voice and his singing voice sounds like his speaking voice a bit. He raps occasionally and speaks in fluent English.

Though of course you can always conduct your own research. ^^ I only know what I’ve searched and listened, meaning I’ve had no voice training or anything of the like—this is just how I learned whose voice belonged to whom.

I ALSO HAVE WAY TOO MUCH TIME ON MY HANDS I mean.

Tenor: the adult male voice intermediate between the bass and the alto or countertenor.

Bass: the lowest adult male voice usually having a range from E a 13th below middle C to D a tone above it

Baritone: a male voice or voice part intermediate between tenor and bass.

Falsetto: an unnaturally or artificially high-pitched voice or register, esp. in a man.

Vibrato: a slight, rapid, and regular fluctuation in the pitch of a note produced on a stringed instrument by a shaking movement of the hand stopping the strings