I fixed it in titledef.tex. Here's the diff :
*** /home/laurent/src/lilypond-1.3.17/tex/titledefs.tex Wed Oct 27 19:34:12 1999
--- /usr/share/lilypond/tex/titledefs.tex Mon Dec 27 23:53:33 1999
***************
*** 64,70 ****
\end{minipage}\par
\parskip\saveparskip
{\center{\large\theinstrument}\par}
! {\flushleft{\large\normalfont\scshape\thepiece}}
% \leavevmode
\global\let\theopus\relax%
\global\let\thepiece\relax%
--- 64,70 ----
\end{minipage}\par
\parskip\saveparskip
{\center{\large\theinstrument}\par}
! {\flushleft{\large\normalfont\scshape\thepiece}\par}
% \leavevmode
\global\let\theopus\relax%
\global\let\thepiece\relax%
--
Laurent Martelli
[EMAIL PROTECTED]
