I want to try learning some music composition in Linux. After some search, I found people do recommend several nice audio software for Linux.
One of these applications is Ardour. You can install 2009's version 2.8 from the official Ubuntu repos. The newest version is available for free as source code or in a limited demo binary from the Ardour webpage. You can also get an unlimited binary paying a small amount. But I wanted to test the newest version without limitations before contributing to the project.