Blue (BigBang song)

"Blue" (Korean: 블루) is a song recorded by South Korean boy group BigBang for their fifth Korean-language extended play (EP), Alive (2012). It was made available for digital download and streaming as the EP's first single on February 22, 2012, by YG Entertainment. The song was written and composed by G-Dragon along with Teddy Park, with additional rap parts penned by T.O.P. Stylistically, the track conveys the emotions of feeling blue—akin to its title—after letting go of a romantic relationship, and showcases a more emotional and vulnerable side of BigBang while at the same time providing a comforting undertone.

"Blue" received generally positive reviews from music critics, many of whom complimented its fresh musical style and composition. It was named the Song of the Month for March at the Cyworld Digital Music Awards and at the Gaon Chart K-pop Awards due to its success on digital platforms. Having debuted at number-one on both the Gaon Digital Chart and the K-pop Hot 100 chart, "Blue" went on to sell more than 3.3 million digital units by the end of the year and was ranked as the fourth best-selling single of 2012 in South Korea.

The music video for "Blue", filmed in New York City, was uploaded in conjunction with the single's release. To promote the track, BigBang appeared on several music programs in South Korea and further included it in the setlist for their Alive Galaxy Tour (2012).