creating a centred column of markups

[Kieren MacMillan]

[Lilypond 2.11.64]

Hi all,

I need a centred column of (left-aligned) markups — it's a poem that  
I want "floating" in the centre of the leading page of a choral score.

I know there have been a lot of changes recently, e.g. the thread  
<http://lists.gnu.org/archive/html/lilypond-user/2008-08/ 
msg00573.html>. I've looked through the docs and the LSR, but can't  
find a simple example showing how this can be done.

What's the final verdict on how to accomplish this?

Thanks,
Kieren.