Napster vs. Itunes vs. Linewire

Napster was the first website where people could download music for free. The government shut that website down and another website called Linewire appeared as well. The government shut that website down too cause it is illegal to download music for free. I have never used Napster or Linewire because I have heard the quality isn't as good and it can infect your computer with viruses. It is also illegal so i would rather not use something that could get me arrested or have me sent to court. I have always used Itunes to download music because it is cheap and the quality is good, and I know that it is a secure site so that my computer won't be infected with any viruses. Whenever the government steps in and shuts an illegal music downloading site down another one will be created, but i'm just gonna stick to using itunes because I can trust it.