Adding lyrics to a "piano" score.

[Alberto Simões]

Hello.

I have a Piano score (three voices) organized in the following way:

upperA = { ... melody ... }
upperB = { ... melody ... }
upper = { ... << \upperA \\ \upperB >> }
lower = { ... melody ... }

and

\score {
  <<
    \new PianoStaff <<
      \new Staff = "upper" \upper
      \new Staff = "lower" \lower
    >>
  >>
...
}

Now, I added a variable named "song":

song = \lyricmode { Song to be re- ad. }

But I can't find a suitable way to associate this lyrics to the upperA
melody (and if possible above the staff).

Can anybody give me a hint?

TIA,
Alberto

-- 
Alberto Simões - Departamento de Informática - Universidade do Minho
                 Campus de Gualtar - 4710-057 Braga - Portugal