Re: Some C9 chords should be Cadd9

[Keith OHara]

Knute Snortum <ksnortum <at> gmail.com> writes:
> 
> Way back in Lilypond 2.14 if you wrote c:9^7 you would get "Cadd9", but now
> you get "C9".  This makes it indistinguishable from c:9.
> 

Thanks, Knute
I thought I remembered the change that caused this, so I added
 https://code.google.com/p/lilypond/issues/detail?id=4222
with a link back to the cause.
The workaround is easy (below) but probably the explicit "add" should be 
default output, with the brief option available to those who want it

  \new ChordNames \with {additionalPitchPrefix = "add" }
  \chordmode {
    c1:9^7 % Cadd9   root-3-5-9
    c1:9   % C9      root-3-5-7-9
  }