Best Girl Groups of All Time
The South Korean girl-group formed by Yubin, Yeeun, Sunye, Sohee and Hyelim formed in 2007 and soon released their debut single, "Irony." Other singles include "Tell Me" and "This Fool." Throughout the 2000s, the group suffered many member rotations, though they are the first Korean group to ever enter the U.S. Billboard Hot 100 chart.