3. Lyrics get mangled. To see this, go to
manuals > learning > 3.4.2 Four part SATB
and extract the Handel example. Add
\layout {}
\midi {}
just above the very last } which terminates the \score.
Save, say as handel.ly <http://handel.ly> . Run lilypond on this.
The pdf looks exactly as it
says in the manual. But run midi2ly on the midi file. This gives
handel-midi.ly <http://handel-midi.ly>
Now run lilypond on that file and 3 lines of lyrics have
disappeared. With more
complicated lyrics, you get error messages about simultaneous lyrics.