Hi Paolo,

> is it possible to draw one or more horizontal lines, above/below the staff, 
> that are completely ignored for collisions with the score's grobs?

Absolutely: just use \with-dimensions-from \null

> Also: is it possible to draw a *grid* as a background for the score?

Yes! Again, use \with-dimensions-from \null, and put the markup in an 
appropriate spot (e.g., header).

Hope that helps,
Kieren.
________________________________

Kieren MacMillan, composer (he/him/his)
‣ website: www.kierenmacmillan.info
‣ email: [email protected]


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