"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.
CD-only cover for "4 Walls"/"Cowboy"
f(x) (; Korean: 에프엑스; RR: Epeuekseu) is a South Korean girl group, consisting of Victoria, Amber, Luna, Krystal, and previously Sulli until her departure from the group in August 2015. Formed by SM, f(x) officially debuted in September 2009 with the release of the digital single "La Cha Ta".
f(x) performing at Jeju K-pop Festival in October 2015 From left to right: Victoria, Krystal, Amber, and Luna
f(x) with Girls' Generation at a showcase for the LG Chocolate cellphone
f(x) in December 2011
F(x) performing as a four-piece group in Trafalgar Square, in August 2015.
