Thanks for the link to the Dylanchords site, Peter -- looks like there is a lot of useful stuff there.
Another question for you all:
I'm wondering if other teachers have suggestions for melodies that use a limited range of notes. I'm working with a guitar student who has a lot of trouble singing in pitch. Most of the lessons we now spend part of the time working on the guitar, and part of the time working on singing.
Right now we're working on "When the Saints Go Marching In" which only has a range of five notes. Anyone have other suggestions for songs that use a small range of notes?