Listen to Justin Timberlake on iHeartRadio

"TKO" is the second single off Part Two of the 20/20 Experience, following "Take Back The Night."  The singer spent most of Thursday teasing the new song on social media.  In the afternoon, he got the attention of fans by posting a photo on Instagram of a hand-written note reading, "Should I release a new single today???" 

Then, throughout the day, he continued to stagger Instagram videos revealing short clips of the song.  The videos show JT and producer Timbaland at work in the studio. 

At midnight Eastern time, Justin finally directed fans to his website to hear the seven-minute track in full.  Justin will close the iHeartRadio Music Festival Saturday night... here's hoping we get to see him perform the new track for the first time!

Part Two of the 20/20 Experience is out on September 30th. 

Check out the new song, "TKO" below.