http://sweetscam.com/how-its-made/

The link will take you to a page where it lists the different sugars sources.  I clicked on high fructose corn syrup and it gives a narrative, so have your speakers turned on.  It was interesting and informative.

There was no mention that GMO corn is excluded from the making of high fructose corn syrup so I guess those who are a little concerned about GMO should refrain from drinking or eating anything with corn.  :-)