Chord names without chords? And one other question.

[Rune Zedeler]

Sorry for not replying but writing new message (why isn't there a
"reply" button on the home page?)
Don't use ChordNameVoice - use ChordNames.
If you wan't the chord names to appear above the GrandStaff then I don't
understand why you placed it below...
You have to enter the things in the order that you want them - it's
quite simple.

Do

\score { \notes 
  < \context ChordNames {...}
    \context PianoStaff <...>
  >
  \paper {
     \translator {
        \ChordNamesContext
        ChordName \override #'style = #'jazz
     }
  }
}

Notice that your other problem (jazz chords) was caused by a misplaced
"s" in the translator.

-Rune