Chord names unexpectedly below the staff

[Hans Aberg]

When I modify the example from Notation 2.7.2 as below (adding "music  
=") and compile in LilyPond 2.13.13, I get the chord names below the  
staff, plus a lot of:
  warning: staff-affinities should only decrease

Though it may be useful to have the chord names below the staff, I'm  
not sure why it happens. Because of the lyrics, the chord names should  
be normally be above the staff.


music = \new Staff <<
  \chords { c2 g:sus4 f e }
  \relative c'' {
    a4 e c8 e r4
    b2 c4( d)
  }
  \addlyrics { One day this shall be free __ }
>>

\score {
  \music
        \layout {}
}

\score {
  \unfoldRepeats \music
        \midi {}
}