Here's a great freeware program that you can use to make your own music. It's just as good as those ones you have to pay for, like Fruity Loops.
Here's the link to the website: http://lmms.sourceforge.net/
Here's the link to a portable version of it from Portableapps.com: http://portableapps.com/node/18823
Note: Even though the title says "Linux" MultiMedia Studio, their latest versions are now available for Windows.
They also have a place where you can share your music. It also supports music made in Fruity Loops.