UPDATE: Lady Gaga's 'Bad Romance' won in Round 3 and has moved onto 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 time for Round 3 of the Greatest Pop Song of the Modern Era, and things are heating up! Last week, Lady Gaga bested Kelly Clarkson with 53% of the votes! Gaga's Little Monsters better be on their A-games, since she's facing off against 'N Sync now. Last round, the boy band defeated Rihanna by almost 40% of the votes! Which song should move one step closer to claiming the title of Greatest Pop Song of the Modern Era?

Lady Gaga's already momentous career became even bigger with the release of 'Bad Romance.' The crazy-catchy track was accompanied by an equally iconic music video that launched Gaga into superstardom. The song was so big that it scored the singer two Grammys.

'N Sync also earned commercial acclaim for 'Bye Bye Bye.' The lead single off of their sophomore album proved the guys were no flash in the pan. 'Bye Bye Bye' was so successful, in fact, that it helped ‘No Strings Attached’ earn top first-week album sales  — a record the band still holds today.

Which pop song is greater? You can vote for Lady Gaga or 'N Sync once an hour until the polls close on March 25 at 12PM ET. The winning tune will move on to Round 4 of our Greatest Pop Song of the Modern era competition!