Wow! It's Etherpad for music scores. Very impressive and very useful to people like me who don't have the interest in purchasing or maintaining something like Sibelius but want to explore musical ideas with other people. Hope it's not too expensive when it exits beta!
I'd like some way to write music like a piano roll or a pad system, or just some alternative to Western classical notation, which I find hard to translate to sounds in my head.
