Mike, I have some processes for creating harmonies through the use of ABC notation, but they usually work best for trad songs. In any event this relies profoundly on the quality of the chords selected - like any quality harmony I guess.

I'm sure you'll receive lots of good suggestions here about ready made material, but if you want to DIY then send me a PM - I will try to keep an eye on this thread in the meantime. A Fake Book with melody and guitar chords is a great place to start, but don't spend any money if don't possess one.

Perhaps a wish list of songs would help. I do have an arrangement of 'Paper Doll' which I worked on a couple of years ago and will gladly share - if I can still find it.

Regards, John