Bob Dylan and will.i.am: together at last? The artists both appear in a Pepsi commercial that may run during the Super Bowl broadcast, singing a song written specifically for the ad. Further details were unavailable.

In addition, Pepsi Co. North America executives say they are considering selling the song on iTunes. The company has two or three minutes of total ad time during the game.

Pepsi Co., which recently re-branded Gatorade simply as G, is likely to use a spot that incorporates rapper Lil' Wayne. Wayne has been heard in teaser spots for the campaign that have been airing for the past month. In them, he talks about all the things the letter G stands for, while icons such as Muhammad Ali to the Jabberwocky dance crew are shown on-screen.

Meanwhile, Sobe Life's spot features a song called "So Believe" that will be sold on iTunes.

In other Super Bowl music-related ad news, the Smashing Pumpkins will unveil a new song, "FOL", in a commercial for Hyundai's Genesis Coupe. Yo Yo Ma will also appear in a separate Hyundai ad during the big game.