1 - move to OpusTeX fonts
2 - make own lilyfont{10,11,13,16,20} files
3 - opustex/lilypond fonts from the same generic driver files
4 - LilyPond fonts should generate TFM spacing info
5 - include important spaacing dims in TFM
6 - lilyrules.mf for different rules (lines) ?
7 - check out Adobe Sonata/Petrucci font layout. They are the
8 standard for Music fonts
9 - rewrite : make a metafont iso font