Prevent multiple similar text marks to appear in score?

[Michael Scheer]

Hi Lilypond users,

I create single instruments (which include textMarks) and the score, which in
my case consists of four instruments. Textmarks are repeated in the score -
is that good practise? I wish they'd only appear once. I understand the
conductor then cannot know what the players see... but still.

%% EXAMPLE BEGIN
\version "2.26.0"
\book {
  \score {
    <<
        \new Staff  { \textMark "a tempo" c'4 f g a }
        \new Staff  { \textMark "a tempo" a4 c' d' f' }
        \new Staff  { \textMark "a tempo" a2 c'2 }
        \new Staff  { \textMark "a tempo" c'4. d'8 f'2 }
    >>
  }
}
%% EXAMPLE END

Best regards
Michael