In October 2015, Eilish recorded the song "Ocean Eyes", initially written by Finneas for his band, and sent it to her dance teacher, who helped choreograph a dance to it.[12][13] "Ocean Eyes" was released as Eilish's debut single on SoundCloud in 2015. A music video was released in March 2016, and a video of Eilish performing a dance to the song was released in November 2016. That year, Eilish also released the single "Six Feet Under".[12] "Ocean Eyes" was certified platinum by the RIAA[14] and
Her debut studio album, When We All Fall Asleep, Where Do We Go? (2019), debuted atop the Billboard 200 and became the best-performing album of 2019 in the U.S.,[2] also reaching number one in the UK. The album contains six Billboard Hot 100 top 40 singles: "When the Party's Over", "Bury a Friend", "Wish You Were Gay", "Xanny", "Everything I Wanted"[a] and "Bad Guy", the last of which became her first number-one single in the US.