15. "SOS" (2006)
In 2006, Rihanna was still a teen pop starlet finding her footing. Her first two singles – "Pon de Replay" and "If It's Lovin' That You Want" – along with debut album Music of the Sun were a strong but not explosive introduction to the star who would go on to break chart records for more than a decade. The "Tainted Love"-sampling dance-pop smash "SOS" would become her first Number One hit, giving a taste of her ability to dominate the clubs with shimmery, aspirational earworms.