notime
unfinished
draw triangle
  3 -4 moveto       @ move to apex
  -3 -6 rlineto     @ line to bottom left
  6 0 rlineto       @ horizontal line to bottom right
  -3 6 rlineto      @ line back to apex
  fill              @ fill it in (solid triangle)
enddraw

[stave 1 treble 1]
c'f [draw triangle] g a | c'-b- [draw triangle] a-g- fg |
[endstave]

