Released on the 2003 album Boom Box, "Sunday Morning" serves as a high-energy anthem that defines No Doubt's later era of pop-punk and rock fusion. The track features Gwen Stefani's signature vocal delivery, characterized by its rhythmic phrasing and melodic hooks, which became a staple of the group's sound during this period. As a key component of the Boom Box catalogue, the song exemplifies the band's ability to blend catchy pop structures with a driving, guitar-heavy rock backdrop. Its enduring popularity stems from its role as a party starter and its integration into the broader landscape of 2000s alternative rock, cementing No Doubt's legacy as a dominant force in the genre.