Apple is soon nearing its 10-billionth song download and to celebrate are offering the person who hits that magic number a $10,000 iTunes credit.  There are a couple ways to win the contest per the officialApple rules:
How to Enter. There are two ways to enter the Promotion:

  1. You will automatically be entered into the Promotion by downloading a song from the iTunes Store.
  2. Non-purchase method: Go to http://www.apple.com/itunes/10-billion-song-countdown/entryform/, fully complete an online entry, including your name, complete mailing address (P.O. Boxes not acceptable), telephone number, and birth date. Once your online entry is complete, hit the “Submit” button to submit an entry. Entry via this method constitutes one (1) entry into the Promotion.

Apple did a similar contest not long ago to celebrate 1 Billion apps.  I know I hope I win, but we wish you luck as well.