Anomalous, or Non-standard, Clefs

[Alan McConnell]

Assembled Wisdom!

Sometimes it is necessary to use an
anomalous key signature.  An example
is: #11 of Bartok's 44 Duos for 2
violins, where the upper violin 
staff has a key signature of B flat
and D flat(with a footnote emphasizing
that this is not a misprint).

Is it possible to create, within lilypond,
a _new_ clef, calling it perhaps "bfdf"
for the above Bartok example?  Then in
the \global section one would write
    \clef bfdf
to get what one wanted?

I am myself interested in writing new
clefs for violin, viola, and cello
where the sharps would be F# G# A#,
giving one of the two possible
whole tone scales, and also clefs
for C# and D#, giving the other.

I have looked at quite a bit of the
documentation and have not found this
capability.  If it already is documented,
please point me at it; if it can be done,
and someone knows how, please let me know!

TIA,

Alan

-- 
Alan McConnell :  http://patriot.net/users/alan
     Have the courage to be ignorant of a great number of things, in 
     order to avoid the calamity of being ignorant of every thing.