Formatting lyrics for different stanzas

[ayutheos]

How do I apply different text formatting for different stanzas of
lyrics globally?

What I have in my .ly file:
=====
\paper  {
    myStaffSize = #20
    #(define fonts
    (make-pango-font-tree "Times New Roman"
                          "Lucida Sans Unicode"
                          "Simsun"
                           (/ myStaffSize 20)))
}

melody = \relative c' { c d e }

lyricI = \lyricmode { a lyric }

lyricII = \lyricmode { a lyric }

\score {
    <<
        \new Voice = "one" { \melody }
        \new Lyrics \lyricsto "one" {
            \override LyricText #'font-size = #-3
            \override LyricText #'font-name = #"Lucida Sans Unicode"
            \lyricI }
            \override LyricText #'font-name = #"Times New Roman"
            \lyricII }
   >>
}
=====

How do I use \roman, \sans & \typewriter to specify font-family to
individual lines of lyrics?

Following the example at
http://www.lilypond.org/doc/v2.16/Documentation/snippets/text#text-formatting-lyrics-syllables
only formats a single word.

Any suggestions appreciated.


--
TY