Update: The fans have spoken -- and Britney Spears' 'Baby One More Time' is the Greatest Pop Song of the Modern era! Get more details here.
The final round of March Music Madness is here! Over the past several weeks -- and over the past four rounds -- you have voted for the Greatest Pop Song of the Modern Era, narrowing down 32 of the best pop songs from the '80s to today to the final two hits that will go head-to-head in the ultimate round. Only one song can be crowned the Greatest Pop Song of the Modern Era -- which will it be?