Ujam

http://www.ujam.com
Purpose
The purpose of Ujam and their slogan is Make your music
How To Use
On the home page you click on UJAM STUDIO.
A new window will pop up and you have three options to create music. You can record vocals or instruments, you can upload an audio file and you can rejam a song template. Then once you've done one of these you go and use a program very similar to garage band, of dragging, dropping, changing and creating.
After that you save your song. Later you can acess your song clicking in UJAM studio on the right bar there will appear all the saved song.
ENJOY!!!\
Example
http://www.ujam.com/users/CGkdH677HXVP
This tool is very usefull for students that have a creative project and want to create a song.