About 1999

"1999" is a song by English singer and songwriter Charli XCX and Australian singer Troye Sivan, released as the lead single from the former's third studio album Charli on 5 October 2018. The single cover was inspired by the 1999 film The Matrix. It follows several singles released earlier in 2018 by Charli XCX and Sivan's 2018 album Bloom. The track reached number 13 on the UK Singles Chart dated 22 November 2018, becoming Charli XCX's tenth top 40 single and first top 15 single since 2015, as well as Sivan's fourth top 40 single and his first top 20 single. A sequel to the track, "2099", was released as a promotional single in September 2019. "1999" is playable in Just Dance Unlimited on Just Dance 2020.

The song contains nostalgic lyrical references to the titular year along with a snare-heavy beat, "fuzzy sawtooth bass and sparking Eurodance keys". Sasha Geffen of Pitchfork stated that the track is "more concerned with the act of remembering than with the specifics of the year it calls up itself" and "fits alongside the rest of Charli XCX's sleek, forward-looking pop songs". The song also references Britney Spears' 1998 debut single, "...Baby One More Time".