Humdrum Emacs Mode

Ideas

1. preview score graphically (and region)
2. where is a note? (show information about a note on cursor, especially octave)
3. easy access to documentation
4. understand split spines (and know the type of the spine being edited)
5. play region
6. smart auto-completion
7. automatic bar number
8. delete/create/copy/paste colum, spine

Screenshots