There are a good number of apps out there for music creation. If you would like to try them, Dyne:bolic (described
here) is a live CD operative system packed with many of the best audio/video/image editing/creation tools that there are in Linux. With the Live CD you can just try the apps without initially installing Linux. If you like it you can later choose another more robust distribution, and you'll already know what applications to use
Disclaimer: please note that the desktop environment that is included with that distribution is designed to be light and simple, however it leaves things to desire in the aesthetic department. Better distro's come with more elegant desktops environment, however for trial purposes it does the trick