Sour is the debut studio album by American singer Olivia Rodrigo. It was released on May 21, 2021, through Geffen Records. Rodrigo stated that the album explores her perils and discoveries as a 17-year-old, with its title referring to the uncomfortable and “sour” emotions youngsters experience but are often shamed for, such as anger, jealousy and heartache. The musical style of Sour was inspired by Rodrigo’s favorite genres and singer-songwriters.

The album was written and produced by Rodrigo and Dan Nigro, alongside few other collaborators. Three singles preceded Sour’s release: Rodrigo’s debut single and the album’s lead single, “Drivers License”, invited global success and acclaim, debuted atop the US Billboard Hot 100, and propelled Rodrigo to mainstream prominence. It was followed by “Deja Vu”, which reached number 8 on the chart, making her the first artist in the Hot 100 history to debut their first two singles inside the top 10. “Good 4 U” was released a week before the album.