CINCINNATI, Ohio - President Obama often exits the stage at the end of his campaign rallies to the recordings of Motown legend Stevie Wonder. Tonight, he did it to the real thing.

As Obama wrapped his rally in Cincinnati, his third of four campaign events today, "Signed, Sealed, Delivered" blasted through the University of Cincinnati's Fifth Third Arena.

The president started to wave to the enthusiastic crowd and then did a double take. There, off to the side of the stage, was Stevie Wonder, belting out his classic tune.

Obama walked back up to the mic and announced, "Stevie Wonder," although he could barely be heard above the impromptu concert. The president swayed back and forth and enjoyed the music briefly before getting to work, shaking hands and posing for pictures.

Stevie Wonder also revved up the crowd before the president's speech, putting Obama's "fired up, ready to go" rallying cry to music.

Mr. Wonder is one of the many famous musicians coming out to support the president in the final days of the campaign. Katy Perry and Dave Matthews performed at his rallies on Saturday. Tomorrow Bruce Springsteen and Jay-Z will lend their star power to the president's last day on the trail.