\version "2.16.2"

TheCadenza = \relative c'' { des8.\fermata ( [ f32 aes ] des16 )
r32 aes [ aes64 bes aes bes aes32 ]
  r32 f [ f64 ges f ges f32 ] r32 des [ des64 ees des ees ]
  \times 4/5 { des64 [ ees des c des ] } }
  
right = \relative c'' {
  \key des \major
  \numericTimeSignature
  \time 3/4
  \cadenzaOn
  \TheCadenza
  \cadenzaOff
  ees2\trill\fermata  |
  des2. |
  
}

left = \relative c' {
\key des \major
  \numericTimeSignature
  \time 3/4
< aes f' aes >4\fermata 
#(skip-of-length TheCadenza)
< aes c >2\fermata | 
< des des, >2. |

}

\score {
  \new PianoStaff 
  <<
    \new Staff = "right" \right
    \new Staff = "left" { \clef bass \left }
  >>
  \layout { }
}