I said in the round one of this comparison that I'd let you know if I got any useful answers to my query on the lilypond list. One of the list contributors got interested in the problem and wrote me a new layout block that does indeed look a lot more like what Petrucci does. You can read the gory details on the list.
Pictures
Here's the first page of the Petrucci facsimile of Adieu mes amours by Josquin:
![[Petrucci facsimile]](http://www.laymusic.org/pictures/adieu/adieu-p1.png)
And here's the cantus part lilypond produces now that I have the new layout block:
![[Lilypond cantus]](http://www.laymusic.org/pictures/adieu/cantus-michael.png)
And here's the tenor part from lilypond with the new layout block:
![[Lilypond tenor]](http://www.laymusic.org/pictures/adieu/tenor-michael.png)
![[Buy from the laymusic lulu.com store]](http://www.lulu.com/services/buy_now_buttons/images/gray.gif)
![[SerpentPublications.org]](http://www.serpentpublications.org/wordpress/wp-content/themes/serpentpublications/images/spbanner-colorbox.png)
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[...] my last post on the subject of trying to get Petrucci-like spacing out of lilypond, someone came up with a [...]