Cast your ballot for the best Top 5 single of the past year.
Last year's Billboard.com Hot 100 March Madness put a twist on the ever-popular college basketball tournament and asked pop fans to vote for their favorite recent No. 1 song on Billboard's Hot 100 chart. Hundreds of thousands of votes were cast, and Britney Spears' "Hold It Against Me" eventually emerged victorious from the field of 32 songs!
At long last, Hot 100 March Madness is back -- with some updated rules for 2013. Instead of pitting the last 32 No. 1 Hot 100 tracks against each other, we've gathered every smash single to grace the Top 5 of the chart over the past year, and placed them in head-to-head match-ups. Over the next month, it'll up to you to vote in the bracket-style tournament and determine which song is the absolute best of these 32 hits!
Check out the full Hot 100 March Madness bracket below, and then support your individual favorites in the first round of voting.