Online places such as eBay and Half.com have a healthy supply of older iPods because the product inventory is user generated.
Rather than using a single metric, OKC allows you to use any user-generated poll to determine who is match and who isn't.
Since the site doesn't organize their tabs by genre, the easiest way to find holiday music is to search through the user-generated play lists.
Use your own discretion about adding user-generated tabs to your personal collection.
Mostly all of the content is user-generated, so expect to find a few mistakes or errors here and there.