Deryk, rayc and Greg: thanks!!!

Hans: yes, believe it or not, I had exactly the same thought about the vocals. I was thinking that maybe a background "ooh" vocal would be nice in the second half of the song, perhaps? As you can of course tell, the song's chord progressions repeat themselves at the halfway point, so that's where I thought I'd insert the voices. Why didn't I? Honest answer (don't laugh): in the heat of writing things, etc., I just forgot. But ... I will see what happens if I try that! Thanks!