How to have an extra measure at the beginning of a score

[Stef Epardaud]

Hi,

I'm writing drum scores and it's traditional that we put an extra
measure at the beginnning to indicate what all the notes point to in
terms of percussion elements. This measure should be unnumbered and
alone on its line. I have not found any way to force a line break, or to
separate it from the rest of the score, so it's always measure number 1
and the rest of the score starts at 2, is there a way to do this ?

Thanks a lot for any help.
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