Questions About unblocked music websites

My laptop won't download music!!!?

Okay i have a high school laptop, so many websites are blocked. But, I am on an unblocked music sharing site and whenever i try to download an mp3 from it, it just downloads in like a second and says that its 0 bytes. The files that I download don't work. Although, before this problem, on the websites that I attempt to download mp3's at worked perfectly......SOMEBODY HELP ME!!!!! music is my life, lol. :-)