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"Apt." (abbreviation for "Apartment") is a song by New Zealand and South Korean singer Rosé and American singer-songwriter Bruno Mars. It was released through The Black Label and Atlantic Records on 18 October 2024, as the lead single from Rosé's debut studio album, Rosie (2024). "Apt." marked Rosé's first solo single in three years and her first release since departing from YG Entertainment and Interscope Records in 2023. The song was written and composed by various contributors, including Rosé and Mars. It is an up-tempo pop rock and pop-punk track, featuring indie rock and electropop influences. Inspired by a South Korean drinking game, the song's chorus is built around the game's rhythmic chant of apateu (Korean: 아파트; lit. apartment).