\version "2.19.25"

\layout {
  \context {
    \Voice
    melismaBusyProperties = #'(melismaBusy)
  }
}

tenor = {
  a'\melisma d''\melismaEnd d''
}

tenText = \lyricmode {
  Kei -- ner
}

\score {
  \new StaffGroup <<
    \new Staff \tenor
    \addlyrics \tenText
  >>
}