2 \tempo command at the same time

[Anton Curl]

Hi everyone!

I'd like to put an indication displayed in all the parts but only once 
in the score, like a tempo mark.

I found this syntax:
  \tempo \markup { "swing" }
But at the same place in the score, I already have a \tempo command:
  \tempo 4=125
  \tempo \markup { "swing" }
  c

And Lilypond ignore the second.

What do I have to do to display both indications?

Thanks

Anton Curl