LilyPond: Espresso Rag hand crossing, by gpt-6.1-sol
gpt-6.1-sol · round 3 of 3 · seed 1$0.04SVGMP3MIDIrag.ly
rag.ly · 100 lines
\version "2.24.1"

\header {
  title = "Espresso Rag"
  subtitle = "A café two-step"
  composer = ""
  tagline = ##f
}

\paper {
  #(set-paper-size "a4")
  indent = 12\mm
  short-indent = 0\mm
  top-margin = 12\mm
  bottom-margin = 12\mm
  system-system-spacing.basic-distance = #20
  ragged-last = ##f
}

global = {
  \key c \major
  \time 2/4
}

rightHand = {
  \global
  \tempo "Easy café rag (straight sixteenths)" 4 = 104
  \clef treble
  % 1–4: a crisp, syncopated café tune.
  e''8\mf-\markup { \italic "Light and jaunty" } g''16 a''~ a''8 g''8 |
  e''16 g'' e'' c''~ c''8 <e'' g''>8-. |
  f''8 a''16 c'''~ c'''8 a''8 |
  b''16 a'' g'' f''~ f''8 <b' d''>8-. | \break
  % 5–8: a little chromatic seasoning and a dominant turnaround.
  e''8 g''16 a''~ a''8 <e'' g''>8 |
  cis''16 e'' g'' a''~ a''8 g''8 |
  f''8 a''16 f''~ f''8 e''16 d'' |
  <b' d''>8-. <d'' f''>8-. <b' g''>4-> | \break
  % 9–12: the right hand accompanies BELOW the crossing left hand.
  \change Staff = "lower"
  \stemDown
  c'8\p^\markup { \italic "R.H. accompaniment" } <e' g'>8-. g8 <e' g'>8-. |
  c'8 <e' g'>8-. g8 <e' g'>8-. |
  c'8 <f' a'>8-. a8 <f' a'>8-. |
  b8 <f' g'>8-. g8 <f' g'>8-. | \break
  % 13–16: both hands return, then a compact closing flourish.
  \change Staff = "upper"
  \stemNeutral
  e''8\mf^\markup { \italic "Hands return" } g''16 a''~ a''8 g''8 |
  cis''16 e'' g'' a''~ a''8 <cis'' e''>8 |
  <d'' f''>8 a''16 f'' <b' d''>8 g''16 f'' |
  e''16 g'' c''' g'' <c'' e'' g''>4->\fermata \bar "|."
}

leftHand = {
  \global
  \clef bass
  % 1–8: dry, buoyant oom-pah; no sustained pedal.
  c8-\markup { \italic "Crisp bass; very little pedal" } <e g>8-. g,8 <e g>8-. |
  c8 <e g>8-. g,8 <e g>8-. |
  f,8 <a c'>8-. c8 <a c'>8-. |
  g,8 <b f'>8-. d8 <b f'>8-. |
  c8 <e g>8-. g,8 <e g>8-. |
  a,8 <cis g>8-. e8 <cis g>8-. |
  d8 <f a>8-. a,8 <f a>8-. |
  g,8 <b f'>8-. <g, g>4-> |
  % 9–12: actual cross-staff exchange; L.H. is above R.H.
  \clef treble
  \change Staff = "upper"
  \stemUp
  g''8\mp^\markup { \bold "L.H. over R.H. (bars 9–12)" } e''16 g''~ g''8 c'''8 |
  b''16 c''' b'' g''~ g''8 e''8 |
  a''8 c'''16 a''~ a''8 f''8 |
  g''16 a'' g'' f''~ f''8 d''8 |
  \change Staff = "lower"
  \clef bass
  \stemNeutral
  c8 <e g>8-. g,8 <e g>8-. |
  a,8 <cis g>8-. e8 <cis g>8-. |
  d8 <f a>8-. g,8 <b f'>8-. |
  c8 g,8 <c, c>4->\fermata
}

\score {
  \new PianoStaff \with { instrumentName = "Piano" } <<
    \new Staff = "upper" \with { midiInstrument = "acoustic grand" }
      { \rightHand }
    \new Staff = "lower" \with { midiInstrument = "acoustic grand" }
      { \leftHand }
  >>
  \layout {
    \context {
      \Score
      barNumberVisibility = #first-bar-number-invisible-save-broken-bars
      \override BarNumber.break-visibility = ##(#f #f #t)
    }
  }
  \midi { }
}
round 1 of 3
Espresso Rag, with the left hand crossing over, by GPT-6.1 Sol, the render after round 1
123What the model saw after each round. The picture above is the round that was scored, round 3.
gallery/Espresso Rag, with the left hand crossing over/GPT-6.1 Sol, run 1

Espresso Rag, with the left hand crossing over: GPT-6.1 Sol

modelopenai/gpt-6.1-soltasklilypond-espresso-rag@v1, checks c1, harness h1date2026-10-04rounds3 of 8 allowed, 12 minutes on the clockcost$0.0379thinkingmediumtokens34,506 in, 2,340 out, of which 481 reasoningtime1 min 9 s
Piano staffdecided by a number, from the filepass
Sixteen barsdecided by a number, from the filepass
Left hand crossesdecided by a number, from the filepass
Right hand keeps goingdecided by a number, from the filepass
Crossing markeddecided by a number, from the filepass
Stems apartdecided by a number, from the filepass

There is no post about this one, since only some results need one, so the picture, the source and the scoring are here instead.

its other runs
Espresso Rag, with the left hand crossing over, by GPT-6.1 Sol, run 2run 2 · 2r · $0.0284Espresso Rag, with the left hand crossing over, by GPT-6.1 Sol, run 3run 3 · 4r · $0.0483
same prompt, other modelsall 12 runs on Espresso Rag, with the left hand crossing over →
the prompt it was given
Write, in LilyPond, 16 bars of café piano music called "Espresso Rag" in which the left hand crosses over the right hand for bars 9 to 12.
Frozen at v1. This model got this and nothing else.
ground truth

LilyPond's own record of every note: its hand, staff, bar, pitch and stem, read while the file is engraved. A voice belongs to the hand whose staff it starts on, unless its notes are labelled with a hand's name. The script was written after hearing Sol's and Pareto's runs, so Luna was its first fair test. How good the music sounds is rated by ear. How it is scored, and this run's files on GitHub.