car squealing like a pig after 3k rpm

[YellwMonky]

Okay, well i was driving home the other day and noticed that my car is a LOT louder than normal <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/sad.gif" border="0" valign="absmiddle" alt=''>. It sounds like the fan is a lot louder and much deeper. That's between 2 and 3k rpm that my fan sounds really loud. Then all of a sudden after 3k rpm it starts to let out a real loud squeal <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/cry.gif" border="0" valign="absmiddle" alt=''> . I've opened up the hood but i dont see anything visually that can be scraping. Any ideas on what to do ? The squael is driving me nuts. I can even hear it through my music