Pink Tape - f(x)

f(x)'s 2013 second album is often named among the best K-pop albums of its decade, and the reason is how far it strays from the title track. Rum Pum Pum Pum is quirky enough, but Shadow is eerie and minimal, Airplane is bright electro-pop, and Goodbye Summer, a wistful duet with EXO's D.O., became a fan favourite without ever being promoted. Choose it for experimental pop that never stops being catchy.