This is a font of music symbols.  All MF sources are original.  Most
of the doco is in comments in the MF code, and in
Documentation/tex/fonts.doc

To make xpms of feta20 font:

    make xpms


Accordion symbols are broken: comment-out 

    input feta-accordion;

from feta-schrift, and remake mf dir:

    make clean
    make all xpms