"Oh!" is a pop song recorded by Girls' Generation. It is the first track on their second studio album Oh! and was used as the lead single. The song was released on various online music sites on January 23, 2010 and reached the #1 spot on the Monkey3 online music chart instantly after its release and on other music sites. The song reached #2 on the Gaon 2010 digital yearly charts with 3,316,889 copies sold. The music video for the single was released January 27, 2010 after the teaser was released on January 23.