"Lo Vas A Olvidar" is a song by Billie Eilish and ROSALÍA about a past romantic relationship that has ended. The lyrics revolve around the idea of wondering if the other person still misses or forgives the speaker. The song acknowledges the toxicity of the relationship and the pain it caused, with references to "veneno" (poison) and the need to move on and forget. The chorus repeats the question, "¿Lo vas a olvidar?" which translates to "Are you going to forget it?" The lyrics also touch on the idea that love cannot be measured by steady steps and the unpredictability of emotions. Ultimately, the song expresses a sense of uncertainty and resignation about the relationship's end.

Billie Eilish Pirate Baird O'Connell, born December 18, 2001, is an American singer-songwriter. She first gained public attention in 2015 with her debut single "Ocean Eyes", written and produced by her brother Finneas O'Connell, with whom she collaborates on music and live shows. In 2017, she released her debut extended play (EP), titled Don't Smile at Me. Commercially successful, it reached the top 15 of record charts in numerous countries, including the US, UK, Canada, and Australia. Eilish has received multiple accolades, including seven Grammy Awards, two American Music Awards, two Guinness World Records, three MTV Video Music Awards, three Brit Awards, a Golden Globe Award and an Academy Award. She is the youngest artist in Grammy history to win all four general field categories—Best New Artist, Record of the Year, Song of the Year, and Album of the Year—in the same year. She has a history of political activism, focusing on climate change awareness and women's equality. She was honored as one of the BBC 100 Women in December 2022.