\version "2.16.2"

global = {
  \key des \major
  \numericTimeSignature
  \time 3/4
}
right = \relative c'' {
  \global
s2.
}
left = \relative c' {
  \global
  \once\override Beam.concaveness = 0
des,8 \times 4/6 { f32  [ aes des \change Staff = "right" f aes des ] } s2 |
}
\score {
  \new PianoStaff \with {
    instrumentName = "Piano"
  } <<
    \new Staff = "right" \right
    \new Staff = "left" { \clef bass \left }
  >>
  \layout { }
}