Carl Worth [Sat, 17 Sep 2011 06:55:51 +0000 (23:55 -0700)]
Draw a second staff (and vertical lines at the beginning and end of staff).
This is almost the grand staff necessary for a piano score, (missing
the brace). The _draw_grand_staff function is a bit too specialized. A
more general approach will involve the ability to add an arbitrary
number of staffs (staves?) to the score, and selectively tie some
together (with or without a brace).