I was browsing the web the other day, and I came across a website that offers free downloads of every simpsons song: http://www.simpsoncrazy.com/downloads/music.shtml

Is this against copyright laws, if it isnt then could I do the same for my website (a fansite for a different tv program)?

its fine as long as it is subject to copyright. u can tell that u can copy it by looking by the music files. and yes you can make a fansite for another tv program.

If the webdesigner got permission from the music's original source, it's fine. Otherwise, it's illegal.