Global override for chord properties

[Basil Crow]

I'd like to globally reduce the size of my chord names. Right now, I 
have the following in a chordmode block:

\chordmode {
   \override ChordNames.ChordName #'font-size = #0
   . . .
}

Which works, but requires me to duplicate the "override" in every set of 
chords. Is there a way to set it once for a document instead of 
individually?

--Basil