"G.U.Y." (an acronym for "girl under you") is a song by American singer Lady Gaga from her third studio album, Artpop (2013). She co-wrote and co-produced the song with Zedd. It debuted on Italian radio as the album's third single on March 28, 2014. "G.U.Y." was developed while Gaga was touring with Born This Way Ball, and was recorded a number of times for the final version. It is an EDM track containing elements of industrial, contemporary R&B, and house music whose lyrics address a number of subjects like sexual dominance, submission, and gender roles.

"G.U.Y." received mixed reviews from music critics, who complimented the composition of the track and Gaga's vocals, but criticized its lyrics and production. The song debuted on the record charts of a few countries, but failed to enter the top ten in most of them. In the United States, "G.U.Y." became Gaga's second lowest charting single on the Billboard Hot 100, peaking at number 76. It reached the top ten on Bulgarian airplay chart, the Billboard Greek Digital Songs chart, and the US Hot Dance Club Songs chart.

The music video for the song was shot at Hearst Castle, located near San Simeon. The video featured reality TV show actors like The Real Housewives of Beverly Hills, and works of artist Nathan Sawaya and YouTube's Minecraft gamer SkyDoesMinecraft. Running for over 11 minutes, the video shows Gaga as a wounded fallen angel who is revived by her followers in a pool. Once rejuvenated, she takes revenge on the men who hunted her and replaces them with clones known as G.U.Y. The video received positive reviews for its visuals and its references to Greek mythology. Gaga has performed "G.U.Y." at her seven day residency shows at Roseland Ballroom in March 2014 and on her ArtRave: The Artpop Ball tour; in both places she emulated the choreography from the music video on stage, and received positive critical response.

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