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