different tempos

[Kostia Rapoport]

hi, my name is kostia, i am a student of composition and this is my first post. 
first of all: thank you for lilypond! amazing software and ideology behind it!!

now, i have a question concidering music where each instrument plays its own, 
individual tempo that, in addition, may change during the piece. i've tried to 
write down a piece with different tempos by using the \compressMusic - command 
and making one huge bar for the whole piece with different lengths for each 
staff. but this led to extremely uncomfortable time signatures and i couldn't 
find out how to make appropriate line breaks: i seem to get one line for the 
whole piece, which of course doesn't fit on the paper. did anyone try to solve 
similar problems and has some useful suggestions for me? (i'm very new to 
lilypond...) or is there even the possibility to somehow set an individual 
tempo (in bpm maybe) for each staff and get a notation that would be 
proportionally correct, somewhat like space-notation?

i hope, that i express myself clearly. if not, i will try to post an example 
(must still find out how to do that on that list? just attaching a pdf to the 
email?)

thanks! and my best wishes for the new year!

kostia.
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