\version "2.18.2"

descant = \relative c' {
  d4 | g g g | g2
}

melody = \relative c' {
  g4 | c c g | c2
}

altMelody = \relative c' {
  g4 | c c c | c2
}

melSplit = \partcombine \melody \altMelody

\new Staff \with {
  instrumentName = "1."
}
<<
  \clef "treble_8"
  \key c \minor
  \time 3/4
  \partial 4
  <<
    \descant \\
    \melody \\
    \altMelody
  >>
>>

\new Staff \with {
  instrumentName = "2."
}
<<
  \clef "treble_8"
  \key c \minor
  \time 3/4
  \partial 4
  <<
    { \new Voice \voiceOne \descant }
    { \new Voice \voiceThree \melody }
    { \new Voice \voiceTwo \altMelody }
  >>
>>

\new Staff \with {
  instrumentName = "3."
}
<<
  \clef "treble_8"
  \key c \minor
  \time 3/4
  \partial 4
  <<
    \descant \\
    { \partcombine \melody \altMelody }
  >>
>>

\new Staff \with {
  instrumentName = "4."
}
<<
  \clef "treble_8"
  \key c \minor
  \time 3/4
  \partial 4
  <<
    { \new Voice \voiceOne \descant }
    { \new Voice \voiceTwo \partcombine \melody \altMelody }
  >>
>>

\new Staff \with {
  instrumentName = "5."
}
<<
  \clef "treble_8"
  \key c \minor
  \time 3/4
  \partial 4
  <<
    \descant \\
    \melody
  >>
>>

\new Staff \with {
  instrumentName = "6."
}
<<
  \clef "treble_8"
  \key c \minor
  \time 3/4
  \partial 4
  <<
    \descant \\
    \melSplit
  >>
>>

\new Staff \with {
  instrumentName = "7."
}
<<
  \clef "treble_8"
  \key c \minor
  \time 3/4
  \partial 4
  <<
    \descant \\
    { \relative c' {
      g4 | c c <g c> | c2
    } }
  >>
>>