The boss

Many of the musicians on Obama's iPod, such as Bruce Springsteen, are supporting his White House bid.

Earlier this month, Dylan said he believed Obama was redefining politics in the US and could bring change to a nation in upheaval.

"I've got to say, having both Dylan and Bruce Springsteen say kind words about you is pretty remarkable," Obama said. "Those guys are icons."

Obama said he had not met Springsteen but that the two had talked over the phone.

"Not only do I love Bruce's music, I just love him as a person," Obama said. "He is a guy who has never lost track of his roots, who knows who he is, who has never put on a front."

He added that, when speaking to the singer, he addressed him by his moniker the Boss. "You've got to," Obama said.