Music fans have again discovered how to tilt the odds in their favor in the latest Pepsi iTunes promotion. CNET News is reporting that like last year’s Pepsi iTunes promo, enterprising music fans can sidestep the element of chance by way of a low-tech "hack." They can simply hold a bottle up at just the right angle and see either "Free Song" or "Please play again." The contest began January 31. Specially marked bottles have a 1 in 3 chance of having a free song download message printed on the underside of the cap.