My impression of Jazz++ is that development has stopped. You should take a look at Rosegarden4 and Muse to start with. There's also http://dynebolic.org/ which is focused on multimedia, and i know there are more linux-distro's focused on multimedia. Apart from that, there's also BeOS which can still be downloaded and installed, although sometimes a bit harder to install than Linux. Here's an URL with music-info for Linux : http://linuxresource.com/Audio-Video/index.php ... happy linuxing!