I doubt Sandman will have used lilypond. Anyway, here is an abc2ly conversion of a version of the an abc of Kesh Jig taken from the Internet.

Original abc:

  X:1
  T:The Kesh Jig
  O:Ireland
  S:John B. Walsh Session Tunes
  R:Jig
  M:6/8
  K:G
  P:A
  |:D|"G"~G3 GAB|"D"ABA ABd|"G"edd gdd|"G"edB "D"dBA|
      "G"~G3 GAB|"D"ABA ABd|"G"edd gdB|"D"AGF "G"G2:|
  P:B
  |:A|"G"~B3 dBd|"C"ege "G"dBG|"G"~B3 dBG|"D"ABA AGA|
      "G"BAB dBd|"C"ege "G"dBd|"G"gfg "D"aga|"G"bgf g2:| 
  

Lilypond:

  \version "2.7.40"
  \header {
          crossRefNumber = "1"
          footnotes = ""
          origin = "Ireland"
          subtitle = "John B. Walsh Session Tunes"
          tagline = "Lily was here 2.18.2 -- automatically converted from ABC"
          title = "The Kesh Jig"
  }
  voicedefault =  {
  \set Score.defaultBarType = ""
  
  \time 6/8 \key g \major   \repeat volta 2 {   d'8  \bar "|"   g'4. ^"G"^"~"    
  g'8    a'8    b'8  \bar "|"   a'8 ^"D"   b'8    a'8    a'8    b'8    d'8  
  \bar "|"   e'8 ^"G"   d'8    d'8    g'8    d'8    d'8  \bar "|"   e'8 
  ^"G"   d'8    b'8      d'8 ^"D"   b'8    a'8  \bar "|"       g'4. ^"G"^"~"    
  g'8    a'8    b'8  \bar "|"   a'8 ^"D"   b'8    a'8    a'8    b'8    d'8  
  \bar "|"   e'8 ^"G"   d'8    d'8    g'8    d'8    b'8  \bar "|"   a'8 ^"D" 
    g'8    fis'8      g'4 ^"G" }     \repeat volta 2 {   a'8  \bar "|"   b'4. 
  ^"G"^"~"    d'8    b'8    d'8  \bar "|"   e'8 ^"C"   g'8    e'8      d'8 
  ^"G"   b'8    g'8  \bar "|"   b'4. ^"G"^"~"    d'8    b'8    g'8  \bar "|"   
  a'8 ^"D"   b'8    a'8    a'8    g'8    a'8  \bar "|"       b'8 ^"G"   a'8    
  b'8    d'8    b'8    d'8  \bar "|"   e'8 ^"C"   g'8    e'8      d'8 ^"G"  
   b'8    d'8  \bar "|"   g'8 ^"G"   fis'8    g'8      a'8 ^"D"   g'8    
  a'8  \bar "|"   b'8 ^"G"   g'8    fis'8    g'4  }   
  }
  
  \score{
      <<
  
          \context Staff="default"
          {
              \voicedefault 
          }
  
      >>
          \layout {
          }
          \midi {}
  }
  

I've put the resulting pdf at http://jonbanjo.com/temp/kesh.pdf