Comment #6 on issue 2742 by [email protected]: Patch: Add support for Cyrillic in texinfo.
http://code.google.com/p/lilypond/issues/detail?id=2742
Sigh. It seems that Debian TeXLive 2009 installs the cm-super fonts without its Cyrillic support files. Please install the LH package.
I'm running a full TeXLive which doesn't exhibit this problem.
