: Multiple voices (divisi) in one part In LilyPond, how do you produce results like this? I want to go from a regular section to divisi, but I am unable to figure it out. I attempted to use parallelMusic and new StaffGroup,

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One possibility is to typeset that music using two different parts. Then, you specify RemoveEmptyStaves to hide the lower voice for the first few measures. If it's the opening measures you're hiding, you also need to override some Score presets. Input into their correct contexts, the necessary code will be:

version "2.18.2"

sop = relative c'' {
c8 e g e c e g e |
c e g e c e g e |
c e g e c e g e |
c e g e c e g e |
c e g e c e g e |
c e g e c e g e |
}

alt = relative c'' {
R1 |
R |
R |
R |
R |
c2 e4 g |
}

layout {
context {
Staff RemoveEmptyStaves
}
context {
Score
override VerticalAxisGroup.remove-first = ##t
}
}

score{
context StaffGroup <<
sop
alt
>>
}

See more here at the LilyPond Snippet Repository.

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Googling "lilypond multiple voices" could've helped ;) Depending on what you want to do exactly there's multiple options: lilypond.org/doc/v2.18/Documentation/notation/multiple-voices

For longer passages it would be: (example from the guide)

new Staff <<
new Voice = "first"
{ voiceOne r8 r16 g e8. f16 g8[ c,] f e16 d }
new Voice= "second"
{ voiceTwo d16 c d8~ d16 b c8~ c16 b c8~ c16 b8. }
>>

I.e. you simply need to explicitly declare the separate voices