Usher had the audience on their feet all night long during his iHeartRadio Music Festival 2012 performance.  

Listen to Usher on iHeartRadio.

He started with "OMG" and kept up with his polished backup dancers throughout the song.

The next thing we know, Usher's taking it back and started singing "Yeah". He grinned once he noticed that the crowd recognized the tune.

Click here for full coverage of the 2012 iHeartRadio Music Festival.

Yes, Ursh, "Yeah" is still a fave. How did you know?

The energy switched up as he performed "Burn", to which he said, it's "an oldie that's slowly becoming a goodie."

After he sung a few more of his hits, Usher closed his set with "Climax" which turned out to be a fan favorite. The arena sang "Climax" along with Usher in unison.

Mr. Raymond shut it down and talent manager/marketing extraordinaire, Scooter Braun -he's known for the success of Justin Bieber- agrees:

And that ladies and gentleman is why @usherraymondiv is one of the greatest entertainers of all time!! Wow! #IHEART radio #Vegas

— Scooter Braun (@scooterbraun) September 22, 2012