I agree with those who said that harmonizing is easier than *teaching* someone how to do it. Those tapes sound like a terrific resource.

Some of the midi files in my tunebook web site may help, too, as they almost always contain a harmony line on its own track. To learn harmony from these (or any other midi files you find) download Noteworthy, a shareware sequencing package. Use it to isolate the melody line and harmony line, then reduce the relative volume of the melody line and follow the harmony, both aurally and visually through the notation.