Songfacts®:

• The bossa nova is a jazz-tinged Brazilian music style that evolved from samba in the mid-20th Century. Characterized by a smooth feel, it is more complex harmonically than samba and less percussive. In Portuguese, "bossa nova" literally translates as "new trend" or "new wave."
  
  Penned by Antonio Carlos Jobim and Vinícius de Moraes and first recorded by Joao Gilberto in 1957, "Chega de Saudade" is widely regarded as the first recorded bossa nova song. Six years later, Stan Getz and Astrud Gilberto's "The Girl From Ipanema" became the first bossa nova single to achieve international popularity.
  
  Here, over a bossa nova beat created by her brother Finneas, Billie Eilish sings of sneaky romantic rendezvous in hotel rooms.
• Eilish uses the bossa nova sound to evoke a seduction behind closed doors as she uses fake aliases and locked phones to keep her romantic hookup from the press. Finneas told Rolling Stone the lyrics come from the strange life of a touring pop star. "We have to do a lot of goofy bulls--t when we go on tour, where we enter through freight elevators in hotels and stuff, so that paparazzi doesn't follow us to our room," he explained. "And so we acted as if there was also a secret love affair going on in there of Billie being like, 'Nobody saw me in the lobby. Nobody saw me in your arms,' as if there was a mystery person in her life during all of that."
• In a Spotify commentary, Eilish said the song originated with a beat Finneas sent her in spring 2019. "He called it 'Billie Bossa Nova' 'cause it was just a bossa nova-type beat and I was like 'that's amazing' and then nothing happened for a year and a half," she said. "Then we listened to it again and kinda wrote this fantasy, romanticized, glorified, dream."