\begin{lilypond}[staffsize=7,fragment]
\context Voice <<c' e' g'>>
\end{lilypond}
\lilypond[fragment,staffsize=7]{\context Voice <<c' es' g'>>}
\begin{lilypond}[staffsize=7,fragment]
\context Voice <<c' e' g'>>
\end{lilypond}
\lilypond[fragment,staffsize=7]{\context Voice <<c' es' g'>>}