Chords showing on bottom?

[Chris Morris]

Newbie alert: just subscribed to the list. If I can find my answer
elsewhere, please just redirect me.

I have the following .ly content, and the output puts the chordnames
under the piano staff, I'd like them to be on top of the piano staff,
or on top of the voice staff. How can I control this? I've
experimented with various groupings, but I'm not sure.

% comment line
\include "english.ly"

\version "2.2.0"

\paper { raggedlast = ##t }

\header {
  title = "Chords on Bottom example"
  arranger = "Chris Morris"
}

\score {
  \notes <<
    \new Staff {
      \context Voice = "Melody" {
        \relative bf' {
          \key ef \major
          \time 4/4
          r2 r4 f4 | f4 ef4 d4 ef4
        }
      }
    }
    \lyricsto "Melody" \new Lyrics \lyrics {
      The Lord has pro -- mised
    }

    \new PianoStaff <<
      \new ChordNames {
        r1 | \chords { ef:2 }
      }
      \new Staff {
        \clef treble
        \context Voice {
          \relative bf {
            \key ef \major
            r1 | << f1 bf1 ef1 f1 >>
          }
        }
      }
      \new Staff {
        \clef bass
        \relative bf, {
          \key ef \major
          r1 | << ef,1 bf'1 ef1 >>
        }
      }
    >>
  >>
}


-- 
Chris
http://cministries.org