% octaveentry.ly
\version "2.6.3"

\score {
    <<
        \new Staff {  % Referencia -> Do agudo
            \relative c'' {e c f a,}
                
        }

        \new Staff { % Referencia -> Do central
            \relative c' {g' e a f}
        }
        
    
        \new Staff { 
           \clef bass c2 f2  
        }
    
    >>
    
    \midi {}
}