Sunshine Pop is a subgenre of pop music that originated in the mid-1960s, primarily in Southern California. Known for its upbeat, cheerful melodies and lush orchestrations, it often features close vocal harmonies, light, airy arrangements, and a distinctive use of the harpsichord. The genre was most significantly influenced by The Beach Boys' "Pet Sounds" album and had a profound impact on the development of psychedelic and progressive rock. While it faded after the late 1960s, Sunshine Pop remains a significant thread in the tapestry of American pop music history.