Thanks to all who listened and commented. It is really appreciated.
I've written a bunch with Bill. His sense of prosody is some of the best I've seen - particularly for someone who has no musical (instrument - or singing, for that matter) skills at all (by his own admission). He also has a great sense of how to structure a song to truly "work" - which, again, is a rarity in a lyric-only guy - heck, that's rare among songwriters in general - one of the separators, really...