"...Baby One More Time" by Britney Spears
It's only fitting to end a list commemorating the best in 90's music with a song that essentially IS the '90s. This single, released in 1998, complete with its infamous school girl fantasy music video, catapulted Britney Spears to stardom, who was only 17 at the time. With its poppy beats and catchy lyrics, throw this song on while getting ready to hit the town, and don't forget your plaid mini skirt!