polyphony and lyrics

[Jean-Jacques Rétorré]

Hi,
I am a very newbie in Lilypond, and I just type my first piece.
I can't attach the lyrics as I would like to:


8<----------------------------
\score {
    \notes
    \relative c''
    \context Staff <<
         \new Voice {\voiceOne
                       r8 d, \times 2/3 { d d e~ } g'8 g g g  }         
           \lyricsto "" \new Lyrics
           \lyrics { et s'en al -- ler et s'en al -- ler }
        \new Voice {\voiceTwo
                \skip 2   e,2 f2  b2
                }>>
}

8<-----------------------------
The lyrics are not attached to g'8 g g g
the tie e~ e2 is ignored.

Any hint ?

JJR.