Hi Sandro,
I'd like to leave some indications (rythmic, mostly) for bass and guitar at the start of a piece. Right now I'm doing this with a pencil, but I'm wondering how to do it with lilypond. It could be a smaller PianoStaff, on a line by itself. How could this be done ?
Can you provide a small image of what you want to achieve? Then I'm sure some of the helpful folks on this list will be able to lend you a hand.
Best Lukas