SISTAR's Hyorin and Ailee are two of the most powerful voices in Korea.
They both starred in Dream High 2, singing and dancing, which is also another talent of theirs.
With the ability to hit high notes, who do you think has the most powerful voice?
https://www.kpopstarz.com/articles/44726/20131010/k-pop-faceoff-hyorin-vs-ailee.htm