Jim,
I had to google Alan O'Day and sort of vaguely, remember that song BUT I also discovered he wrote Angie Baby for Helen Reddy, one of my all time favourites.

I copied and pasted the other versions/takes of those lines as a lazy way to start the harmonies but thought Woah that works!!

Sadly the decaff tasted awful so she knocked up a weak real coffee and aaaah! that found the spot. That is our secret, don't tell anyone blush

thanks for listening

Alyn