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"Beware" was the first song of Aiko's to reach the US Billboard Hot 100 chart top 40. The song was released as the lead single from her second studio album, Souled Out, on January 31, 2012. It was written by Aiko, Sevyn Streeter, and DJ Mustard, and produced by Mustard. The song is a mid-tempo R&B song that features a heavy use of synths and bass.