Apple has launched a new iTunes promotional campaign in the US with 7-Eleven and Coca-Cola.

There are eight million free songs available in this promotion, which is available when customers buy a "specially marked 32-ounce Slurpee cup" from a participating 7-Eleven store.

Each promotional cup has a special 12-digit code which can be exchanged for a free iTunes download. The promotion started May 23 and ends July 31.