Apple on Thursday began its "Countdown to 10 Billion Songs."
The winner of the countdown--the person that downloads the 10 billionth song--will win a $10,000 gift card. You can download any song from iTunes and be eligible for the prize, the company said.
Apple also posted a list of the most downloaded iTunes songs of all time. The top song right now is the Black Eyed Peas' "I Gotta Feeling."
Apple said you must be 13 or older and live in a participating country. There is a limit of 25 entries per person, per day.