Is there a program that can help me organize my music?

I download lots of songs from limewire and consequently they end up in radom places on my computer, i want to get them organized into my iTunes folder but it would take way too much time to do so. Is there a program I can download that can make this easier to do, or possibly just do it for me? and as far as I could tell, iTunes does not have a feature that can organize all my music, but thats from what I could tell, i could be wrong