\version "2.11.48"

\displayLilyMusic \relative c'' { \tempo 4=120 c1 }
\displayLilyMusic \relative c'' { \tempo "Allegro" 4=120 c1 }
\displayLilyMusic \relative c'' { 
  \tempo "Allegro" 4=120 c1 
  \tempo "Allegro" 4=120 c1 
  \tempo "Allegro" 4=110 c1 
  \tempo "Allegretto" 4=110 c1 
}
\displayLilyMusic \relative c'' { \tempo "Allegro" c1 }
\displayLilyMusic \relative c'' { \tempo "Allegro" c1 \set Score.tempoText = #"blah" d1}
\displayLilyMusic \relative c'' { \tempo \markup{\italic \medium "Allegro"} c1 }