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Guys you should hear this compulsory
Yikes, JM sounds so awful and TH is clear and stable.
What's sad is JM started as a tenor, and he had a very crisp, hip hop style voice. Somehow Hive got in his head and forced him to be a counter tenor (falsetto), which he very clearly isn't cause he cannot sing that high at all.
BT5 have the worst vocal line up of any idol group ever. That's likely why JM is forced to sing so high, because having baritones and tenors leaves no room for range without at least one falsetto. Compare this to 2NE1, who had/have a soprano, a couple mezzo-sopranos and a contralto. They have the high, middle, and low ranges so that can be used for vocal contrast. Another group, Dreamcatcher, have insanely powerful voices and huge ranges, so they do quite the vocal acrobatics in their songs. Compared to BTS, it's deep and deeper. Even if they had a bass in there, it'd just be deep, deeper, deepest, and in male voices the gradual variation between those three isn't stark enough for vocal variation. In songs like Louder Than Bombs for example, the vocal line have to force high notes that don't sound bad but are still clearly unnatural seeming, in order to make the song vocally interesting.
Which leads me to another point: YG is the only group member with a well trained voice. I don't know where he got it from, because it wasn't from Hive. In both rapping and singing he's a baritone (and borders on bass at times), but when rapping he hits so many notes that he makes you forget he's a baritone. He can control pitch too, so his highest and lowest notes don't sound too quiet or too loud. If you listen to him rapping/singing compared to the other group members, you can "hear" his diaphragm. If Hive had selected artists with that kind of skill, BT5 would've had a much stronger vocal line up.