This is Linux Multimedia Studio. A Open Source and free full featured sound creation and mix/synthesize studio for GNU/Linux Operating Systems. That video show a example song that come with it and how to manage the interface nicely.
Site - http://lmms.sourceforge.net/
Program License: GPL (GNU Public License)
Linux Multimedia Studio also known as LMMS is a Copyright � 2004-2008 LMMS Developers.