\version "2.10.10"


annotationsForParts = {
  s1*3 |
  s1^"Refrain" |
% etc.
}

partNotes = \relative c' {
  c1 |
  d2 e |
  f1 |
  g4 a g f |
% etc.
}

partStaffWithAnnotations = \context Staff = "AnnotatedPart" {
  <<
    \annotationsForParts
    \partNotes
  >>
}

partStaff = \context Staff = "Part" {
  \partNotes
}

\score {
  \partStaff
%  \partStaffWithAnnotations
  \layout {}
}