The Rover Boys were a significant American pop trio prominent in the late 1950s. Known for their smooth harmonies and pop-oriented sound, band members Arthur, Paul, and Billy Cowsill made a considerable contribution to the post-World War II pop scene. They are best remembered for their hit songs such as "Graduation Day" and "Little Diane," which showcased their signature blend of vocal harmonies and catchy melodies. Despite their short-lived career, The Rover Boys played a pivotal role in shaping the pop music landscape of their era.