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Good Day (IU song)

"Good Day" is a song recorded in two languages by South Korean singer IU. The Korean version was released on December 9, 2010, as the lead single for IU's third extended play (EP) Real. It was written by Kim Eana, while production was handled by Lee Min-soo. The Japanese version was originally included on IU's first Japanese extended play I□U, released on December 14, 2011, before being released on March 21, 2012, as IU's first single album Good Day.

Background and release
"Good Day" was released on December 9, 2010, simultaneously with the singer's third extended play (EP) Real. On November 15, 2011, Loen announced, that IU was signed to EMI Music Japan and was set to release an extended play with her greatest hits recorded in Japanese, on December 14, 2011, titled I□U. ==Music and lyrics==
Music and lyrics
The Korean version of "Good Day" was written by Kim Eana, while production was handled by Lee Min-soo. In terms of musical notation, the song is composed in the key of A♭ major, with a tempo of 128 beats per minute, and runs for 3 minutes and 53 seconds. ==Reception==
Reception
Writing for New Straits Times, Bibi Nurshuhada Ramli described "Good Day" as IU's breakout song. South China Morning Posts Sylvia Issa described the songs as a "unique musical phenomenon". In November 2019, Billboard magazine compiled a list of the 100 Greatest K-Pop Songs of the 2010s, with the single "Good Day" ranking at number one. Commercially, "Good Day" debuted at number one of the South Korean singles chart on the 51st issued week of 2010. It was selected as Gallup Korea's Song of the Year in 2011. ==Accolades==
Chart performance
Weekly charts Year-end charts == Sales ==
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