What makes So Yesterday by Hilary Duff notable?

'So Yesterday' peaked at number 24 on the Billboard Hot 100 and became a defining anthem for teen pop in the early 2000s. The song's relatable themes of growing up and moving on resonated with a generation, establishing Duff as a significant figure in pop culture and influencing subsequent Disney stars. Released on July 29, 2003, 'So Yesterday' is Hilary Duff's first single from her debut studio album, 'Metamorphosis.' At this point in her career, Duff had transitioned from a successful television star on 'Lizzie McGuire' to a burgeoning pop artist, setting the stage for her musical identity.