Girls' Generation have proven to be one of the top acts in Asia topping the charts in both South Korea and Japan. The nine-member group recently unveiled their first international single titled "The Boys" produced by Teddy Riley (who worked with Michael Jackson) and released in English, Japanese, and Korean versions. The group tested the waters for their U.S. debut (The Boys EP released in January on Interscope) by performing "The Boys" on major television shows like The Late Show with David Letterman and Live! With Kelly. A sub-unit consisting of three members, called Girls' Generation TTS (also known as Taetiseo), recently became the highest-charting K-Pop act on the Billboard 200 with their EP Twinkle at Number 126. With concepts that range from adorable (see Korean single "Oh!") to sexy (check out Japanese single "Mr. Taxi"), Girls' Generation has both a versatility and coherence that define their broad appeal.