UPDATE: Michael Jackson's 'Billie Jean' won in Round 3 and has moved on to the Semi-Finals. Vote for the song here!

Welcome to March Music Madness! Here at PopCrush, we've selected 32 of the most iconic pop songs released from the '80s to today (divided into brackets by decade) — and now it's your job to vote and decide which song will be named the Greatest Pop Song of the Modern Era. May the best song win!

It's a battle for the best song of the 1980s, as Michael Jackson's 'Billie Jean' takes on Cyndi Lauper's 'Girls Just Want to Have Fun' in our March Music Madness tournament. 'Billie Jean' brought in 82.53% of the votes against its Round 2 competitor, Madonna's 'Like a Virgin.' 'Girls Just Want to Have Fun' ended its battle against Bon Jovi's 'Livin' on a Prayer' with 52.27% of the votes. That means that the two songs have now officially topped tunes from Madonna, Prince, U2, Paula Abdul, Bon Jovi and Janet Jackson to face off for the title of Greatest Pop Song of the Modern Era.

The unforgettable and undeniable 'Billie Jean' was the second single off of 1982's legendary 'Thriller.' The propulsive dance hit spent seven weeks at No. 1 and remains not only one of Michael's most beloved tracks but one of the decade's most defining cuts. In our two previous rounds, MJ completely crushed first Prince and then Madonna, with more than 80% of the votes in both instances. Can the Jackson juggernaut be stopped?

Cyndi's fun and frothy first single became not only her personal anthem but a feminist anthem worldwide. 'Girls Just Want to Have Fun,' from debut album 'She's So Unusual,' hit its peak at No. 2 in 1984. The instantly recognizable track remains so beloved it helped Lauper handily beat first-round contender Paula Abdul -- but she only just barely edged out Bon Jovi, with a less than 5 percent margin in the second round. Does Cyndi have enough spunk to beat the King of Pop?

Which of the 1980s' most iconic hits gets your vote for the Greatest Pop Song of the Modern Era? Let us know below! You can vote once every hour until the polls close at 12PM ET on March 25. Either 'Billie Jean' or 'Girls Just Want to Have Fun' will move on to Round 4 in our Greatest Pop Song of the Modern Era competition.