(Some other examples in the documentation).
\version "2.19.83"
%% See:
http://lilypond.1069038.n5.nabble.com/magnifyStaff-and-key-signature-padding-td222389.htmlscaleStaff = #(define-music-function (scaleFac) (number?)
#{
\magnifyStaff #scaleFac
\override KeySignature.padding = #(* 2/3 (- 1 scaleFac))
#})
\new StaffGroup \with {
\override SpanBar.glyph-name = "!"
\remove "System_start_delimiter_engraver"
} <<
\new GrandStaff <<
\new Staff \with {
\RemoveEmptyStaves
\omit TimeSignature
\override BarLine.allow-span-bar = ##f
\scaleStaff #5/7
} { \key c\minor s1*2 e''1 e'' }
\new Staff \with {
\RemoveEmptyStaves
\omit TimeSignature
\scaleStaff #5/7
} { \key c\minor s1*2 f''1 f'' }
>>
\new GrandStaff \with { \override BarLine.allow-span-bar = ##f
} <<
\new Staff \with { \omit TimeSignature } { \key c\minor \clef F c1 c \break d d \break g g }
\new Staff \with { \omit TimeSignature } { \key c\minor \clef F a a b b c' c' }
>>
>>
\layout {
indent = 0
\context {
\Staff
\override VerticalAxisGroup.remove-first = ##t
}
}