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In July 2007, Girls' Generation had their first performance on Inkigayo. The song the girls performed was called "Into the New World", which became their first single. In August 2007, the single "Into the New World" was released. After a short break, the group's first full album was released in late autumn 2007, with the lead single "Girls' Generation". In early 2008, Girls' Generation began promoting their second single, "Kissing You". In March 2008, the album was re-released and re-titled Baby Baby. A third single, "Baby Baby", was used to promote the album.

The group began its first mini-album "Gee" promotion on January 2009 on MBC Show! Music Core. They sang their new single, "Gee", and "Him Nae (Way To Go)", another track from the Gee mini-album. "Gee" is the record holder for the longest-running #1 on music portal M.net (for 8 weeks). They also broke the record on KBS's music show Music Bank by being #1 for 9 consecutive weeks.

Girls' Generation's 2nd mini-album "Genie" was released on June 29, 2009. On October 7, Girls' Generation, along with label-mate f(x), released a digital single named "Chocolate Love" for the 4th edition of the Blacklabel series LG CYON phone, "Chocolate". The group also announced its first solo tour, with two Korean dates in December and other Asian locations to follow. The Korean dates sold out in 3 minutes. The concert is entitled Into The New World after their debut single.

Source: Wikipedia.org