SPIN: The Ever-Inventive f(x) Are Gunning for World’s Greatest Pop Group on ‘4 Walls’
Quote:
But these are minor misgivings, and ones well compensated by 4 Walls’ brighter spots. Nowhere moreso than its title track, a deft U.K. garage upgrade that becomes definitively K-pop with rapper Amber’s surprisingly fire verse and a visionary double-bridge that shifts time, feel and genre with a logic all its own. Taken with the poetry of its video and choreography – as much the art of it as the song, in SM’s estimation – it’s a moving meditation on commitment that could signal a surprise second life for the world’s greatest living pop group.