[TheOtherHobbes]

But why would someone use this instead of Finale, Sibelius, or even MuseScore or Lilypond, all of which are very much better at score editing?

It's really not hard to email someone a Sibelius (etc) file for editing, or even to work together in a session over Skype/Facetime.

I suspect the number of Chromebook owners who can't live without an online music collaboration solution isn't huge.

[rannoup]

Things is that Finale and Sibelius are expensive. They're not very intuitive and convenient for beginners. We do not expect to come as a pro software like them.

Finally we're only 1 year old they're more than 10. Give us some time ;)