"Xanny" (stylized in all lowercase) is a song by American singer Billie Eilish from her debut studio album, When We All Fall Asleep, Where Do We Go? (2019). The singer and her brother Finneas O'Connell co-wrote it, whilst the latter solely handled its production. Musically, it was described as a mid-tempo and jazz-influenced pop ballad. Eilish recalled being inspired by several artists during the track's creation, most notably by Frank Sinatra. Productionwise, her distorted falsetto vocals are prominently layered over a similarly deformed bass in the drop of "Xanny", replicating the feeling of secondhand smoke. Lyrically, Eilish addresses substance abuse among teenagers; she was specifically inspired by the negative effects it had on her friends and ultimately on her.