Trouble with staff group bracket including piano staff

[Qian Li]

Hi, folks, I have attached two files for a sextet. The reason for the format is I have to break them out into parts, but I'm willing to hand-generate those if that's the best solution. I'm having three problems having to do with staves.

1. How do I make the percussion staves Percb, Percd, and Percf two- or single-line instead of five-line? I tried \new DrumStaff \with in the \new Voice blocks but it only made extra blank staves at the bottom.

2. How do I change the StaffGroup bracket to include only the six percussion staves?

3. How do I add piano braces to the left of the piano staves?

Thanks a lot. I would appreciate any comments!

Qian

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