Apple operates different iTunes Stores for each country. You will need an Apple account for each country's store that you want to use. For example, if you are a U.S. resident who loves Japanese music, you will probably want both a U.S. account and a Japanese account. You need to register each Apple account with a different e-mail address. Also, usually, you will add credit card information to each account; however, you can only add a credit card from the country of the account (for example, only Japanese credit cards for the Japan store). So, if you do not have a credit card with a Japanese address, you will need to purchase iTunes gift cards (which you can buy from me).