\version "2.7.39"
\header {

    texidoc = "The property @code{chordNameExceptions} can used
    to store a list of special notations for specific chords."

}


				% 7sus4 denoted with ^7 wahh
chExceptionMusic =  {
    <c f g bes>1-\markup { \super "7" "wahh" }}

				% add to existing exceptions.
chExceptions = #(append
		 (sequential-music-to-chord-exceptions chExceptionMusic #t)
		 ignatzekExceptions)

theMusic = \chordmode {
    c:7sus4 c:dim7/+f
    \set chordNameExceptions = #chExceptions
    c:7sus4 c:dim7/+f
}

\layout { ragged-right = ##t }

<< \context ChordNames \theMusic
   \context Voice \theMusic
>>