The group has released two full albums, three mini-albums, and various singles. Their 2009 hit single Gee holds the record for being the longest running #1 song on KBS's Music Bank, having held the #1 chart ranking for 9 consecutive weeks. 2009 and 2010 also saw the group winning various awards, including consecutive Artist of the Year (Daesang) awards at the Seoul Music Awards, Golden Disk Awards, Melon Music Awards, and the Korean Cultural Entertainment Awards.
The group began a foray into the Japanese music scene in late 2010 under Nayutawave Records, a part of Universal Music, with the Japanese remakes of their 2009 Korean hits Tell Me Your Wish (Genie) and Gee. 2010 saw the group reach considerable success in Japan, in Korea after winning the prestigious Disk Daesang (Album of the Year) and Artist of the Year at the Golden Disk Awards and Melon Music Awards respectively. The group was certified gold by the RIAJ twice in Japan.