Possible bug

[Bertalan Fodor]

With fontencoding set to T1 (for example with \encoding "TeX" it seems 
to be default) at least on cygwin ecrm1000 is looked for, despite there 
is no references in the tex file created. I think this is because the 
default roman font maps to it and the default font is always created, or 
there are 'silent' reference to it. If ecrm1000 is looked for also in 
other distribution I think this may be some kind of bug.

Move away ecrm1000.* from your TeX tree, and run lilypond --verbose:

score { c }

It will look for ecrm1000 and will create it from ecrm.mf if found.

Bert