"Two all beef patties, special sauce, lettuce, cheese, pickles, onions, on a sesame-seed bun." Some ad jingles are nearly impossible to beat, which is why McDonald's latest campaign to celebrate the 40th anniversary of its iconic Big Mac isn't going to mess with success.

Rather than running out a new jingle, McDonald's and its agency, DDB Worldwide, opted to air the old song on TV and use MySpace as a platform for users to submit their own tunes with the now-familiar words.

"We knew there were a lot of consumers out there that would remember the chant, but we also felt like the younger audience was familiar with it, and we wanted them to give us a contemporary version," Jaime Guerrero, account director at Tribal DDB Worldwide in Chicago, told The New York Times.

The contest attracted nearly 1,000 songs. Voting will end July 23.