Greetings Federico,
You wrote
+++
I'm writing a legenda for tablature and I'm using \markup over each bar
to explain the notation. As you can see in the attached example, the
markup blocks are moved vertically to avoid collisions. I'd like to
stretch the bars so that there's enough room for markup.
+++
I haven't tested anything but try "Dialogue over music" in the Notation
Reference
Hope this helps
Regards
Bill
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