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View download options"A" was released on August 12, 2010 as a single, being later included in the group's second mini album So Girls (2011). The song was produced by Han Jae Ho and Kim Seung Soo (also known as Sweetune), who also produced the songs "Rock U", "Pretty Girl", "Honey", "Wanna", "Mister" and "Lupin" for their label-mate KARA.
The promotions of the song started on August 13 in the KBS's Music Bank. It was also promoted on MBC's Music Core, SBS's Inkigayo and Mnet's M! Countdown. .
Video
[M/V]레인보우(Rainbow)Full HD "A"