This was a website I built with some friends that we ended up presenting as our final project for a class. It works best on Chrome. The point of the website was to provide users an ability to dj between songs without having the need to download any software. When you first enter the site, you should log in using your Facebook. After that, you can upload mp3 files and they will be stored on our server and you will always have access to the songs uploaded through your Facebook account.
The site on which the project is currently hosted is down unfortunately.