Idol groups have members who have different responsibilities when they come out and perform.
Some members are dancers, some are projectors and some are singers.
Who are the best male K-pop singers?
https://www.kpopstarz.com/articles/49769/20131120/male-singers-singers-kpop-voices-vocals-jyj-xiah-junsu-super-junior-hyukyung-big-bang.htm