Radium Audio has released Radium 3.0.rc1 for Linux.

Radium is a music editor with a new type of interface. It's inspired by trackers, but has fewer limitations and uses graphics to show musical data.

Most important changes in 3.0:

OpenGL used to show graphics.

Smooth scrolling.

Enhanced graphics and user interface.

Lots of bugs removed and features added.

Price: Free.