of course it would be considered illegal...just as a music artist who uses samples of others work is breaking the law, so would you...

now..since you would be offering this for free uploads, the 'crime' is different, as you are making no profit from it, but...and this is a big but, it is still illegal, and if you got the 'wrong' person's ire up, they could very well make your life miserable...this has already happened....