Music Software For Everyone

Everyone loves music.  Well, let's hope so anyway.  Now, you may not know this, but there is a lot of software out there for making music.  Here are just a few examples.

The Virtual MIDI Piano Keyboard is pretty cool.
http://sourceforge.net/projects/vmpk/?source=dlp

The next piece of software is Hydrogen, which is a drum machine.  I have used it before and I really like it a lot.
http://sourceforge.net/projects/hydrogen/?source=directory