| "4 Walls" | ||||
|---|---|---|---|---|
&sq=Facebook&lang=en&file=File:Fx_-_4_Walls_-_Cowboy.jpg) CD-only cover for "4 Walls"/"Cowboy" | ||||
| Single by f(x) | ||||
| from the album 4 Walls | ||||
| A-side | "Cowboy" (JP ver.) | |||
| Released | October 27, 2015 November 2, 2016 (JP) | |||
| Recorded | 2015 | |||
| Studio | SM Studios, Seoul | |||
| Genre | ||||
| Length | 3:28 | |||
| Label | ||||
| Composer(s) |
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| Lyricist(s) | Lee Seu-ran | |||
| F(x) singles chronology | ||||
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| Music video | ||||
| "4 Walls" on YouTube | ||||
"4 Walls" is a song recorded by South Korean girl group f(x) for their fourth studio album of the same title. The song was written by Jam Factory's Lee Seu-ran, whilst the music was composed by LDN Noise, Tay Jasper, and Adrian McKinnon. It was released on October 27, 2015 as the lead single in conjunction with the release of the album through SM Entertainment, and marked the group's first single since the departure of Sulli in 2015. Musically, "4 Walls" is described as a dance-oriented tropical house song, incorporating stylistic elements from UK garage and deep house. It was released as the group's second double A-side CD single in Japan with a new track "Cowboy" on November 2, 2016.
The track garnered generally favorable reviews from music critics, most of whom highlighted as one of the album's best tracks and complimented the song's music styles. Commercially, the song peaked at number two on both the Gaon Digital Chart and the US Billboard World Digital Songs chart. The butterfly effect-inspired accompanying music video was posted to SM's YouTube channel in conjunction with the single and features the members witnessing themselves in different dimensions. The group promoted the song by performing it on several South Korean music programs throughout late-October and November 2015, including Music Bank and M Countdown.