Newbie beyond recovery or definition, it seems

[Sam Waring]

     I'm experimenting with LilyPond as a way of creating some simple 
melody lines I can kludge into explanations of chant.  However, GSview 
keeps spitting up the first .ly file I've created (see below), complaining 
of an undefined term, and I can't find anything in the FAQs or list 
archives to tell me what I've done wrong.  Also, I'm blest if I can see 
how to code a key signature such as B-flat; again, I read all over the 
place in the online docs and then took my best guess at it, but I've no 
idea that I'm correct.  Elucidation will be welcomed.


Displaying non DSC file C:/cygwin/home/Dustpuppy/plainchant.ly
Unrecoverable error: undefined in \header

--- Begin offending input ---
\header{
filename =      "plainchant.ly"
title =                 "Sarum plain chant"
composer =      "Traditional"
enteredby =     "sjcw"
copyright =     "public domain"
}

\score {
  \notes {
     \time 4/4
     \clef violin
     \key bes \major
     d--2 [e8 f8] g4 | a--4 [b8 e8] [b,8 e8 d8 c8] |
     b1-\fermata
     \bar"|."
  }
  \paper { }
}
--- End offending input ---
file offset = 0
gsapi_run_string_continue returns -21


(Incidentally, adding Gregorian or Sarum notation support to ver 1.5 would 
be favorite, if it's not slated to go in there already.)


                                 Sam