I'm starting to think about writing some music. This would be an attempt at two things. First, it would help me with my guitar playing. Take some of the stuff I have started writing on guitar and turn it in to full fledged songs. The second piece would be to re-learn the music theory I used to know. If I was going to write some music, I would definitely have to re-learn keys and such. The nice thing is re-learning the theory is that I could apply it back to guitar and get better at that.
So, my question is, does anyone know of any music composition software for linux? Open source is obviously first choice. I'd just like something I could basically program music on. Ideas?