Thank you, Malte and Noeck, it works perfectly. I post here another solution, that is interesting because it doesn't use scheme and more easy to understand.
\version "2.19.54" csl = { \change Staff = "left" } csr = { \change Staff = "right" } right = \fixed c' { \clef treble \time 2/4 g8-4 \csl g_4 \csr e-3 \csl e_3 \csr g8-4 \csl g_4 \csr e4-2 \bar "|." } left = \fixed c' { \clef treble s2 s4 c_2 } \score { \new PianoStaff << \new Staff = "right" \right \new Staff = "left" \left >> \layout { } }
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