2012 marked a breakthrough year for K-pop in North America. At the start of the year, Girls' Generation performed the English version of "The Boys" on the late night talk show "The Late Show with David Letterman" and also on the daytime talk show "Live! with Kelly", becoming the first Korean musical act to perform on these shows, and the first Korean act to perform on syndicated television in the United States. In the same year, the group formed their first sub-unit, entitled Girls' Generation-TTS, or simply "TTS", composed of members Taeyeon, Tiffany, and Seohyun. The subgroup's debut EP, "Twinkle", peaked at #126 on the Billboard 200. In May, SMTown returned to California again with the SMTown Live World Tour III in Anaheim. In August, as part of their New Evolution Global Tour, 2NE1 held their first American concert in the New York Metropolitan Area at the Prudential Center of Newark, New Jersey. In November, as part of their Alive Tour, Big Bang held their first solo concert in America, visiting the Honda Center in Los Angeles and the Prudential Center in Newark. The tickets sold out in only a few hours, and additional dates were added. On November 13, the American singer-songwriter Madonna and backup dancers performed "Gangnam Style" alongside Psy during a concert at Madison Square Garden in New York City. Psy later told reporters that his gig with Madonna had "topped his list of accomplishments".