4 Walls

4 Walls is the fourth studio album by South Korea-based girl group f(x), released by SM Entertainment and Genie Music on October 27, 2015. A predominantly electropop and synth-pop record that incorporates various genres, such as house, EDM and UK garage, 4 Walls was composed by several production teams and songwriters, namely LDN Noise, The Stereotypes, Kenzie, Ryan S. Jhun, Makeba Riddick, Carly Rae Jepsen, among others, with Lee Soo-man served as the executive producer of the release. It marked f(x)'s first major release since Red Light in July 2014, and subsequently their first and currently only major release as a quartet since the departure of former member Sulli in August 2015.