Book title showing up on every score in a songbook (2.14.2)

[Christopher R. Maden]

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I have a songbook I created in LilyPond 2.12.3.  I recently upgraded
to 2.14.2.[*]

Suddenly, every song has the book title *and* the song title at the
start.  Using print-all-headers only makes things worse, as I get the
book title but *not* the song title.

Short example:

=-=-=-= songbook.ly =-=-=-=

\version "2.14.2"

\paper {
  print-all-headers = ##t
}

\include "song_music.ly"

\book {
  \header {
    title = "My Songbook"
  }
  \markuplines \table-of-contents
  \bookpart {
    \tocItem \markup { \songTitle }
    \label #'mySong
    \score {
      \songSheetMusic
      \header {
        title = \songTitle
      }
    }
  }
}

=-=-=-= song_music.ly =-=-=-=

\version "2.14.2"

songTitle = "My Song"

songSheetMusic = \new Staff <<
  \relative c' { c4 c c c }
>> 

=-=-=-= end =-=-=-=

I get “My Songbook” on the first page, above “Table of Contents,” as
desired.  (Too close, but that’s a separate issue.)  However, on page
2, I get “My Songbook” again with “My Song.”  That’s a new and
undesired change from 2.12... how do I turn off the book title on each
song?  I can’t find anything in the documentation about this (though
it is entirely possible I’m looking in the wrong places, of course).

Thanks in advance,
Chris

[*] Yes, I do realize 2.16 is the latest stable... go poke
Debian/Ubuntu/Mint about it.
- -- 
Chris Maden, text nerd  <URL: http://crism.maden.org/ >
Axial tilt is the reason for the season.
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