Downloading MP3

Thesis statement: Although downloading mp3 isn't legal, to some extent it must be legal.
Reason 1: Downloading mp3 from the Internet without giving money and to sell it isn't ethics. I accept.
Reason 2: Everyone can't afford to buy original CDs.
Reasons against: Some people say it is illegal for everyone because it affects creators of the songs.
Refutation: If a student downloads mp3 just for listen, it shouldn't be illegal, because in this situation there is no aim to gain money.