There exist a large compilation of Child Ballad tunes published back in the early '70's, maybe before then, which I believe are still in print. An author's name of Bronson comes to mind. There are several volumes, and there are a large number of tune variants for most ballads. The title is something very general such as "The Tunes to the Child Ballads." Any library or bookstore could track it immediately for you. Copies of these volumes are generally not stocked by bookstores. Most college music libraries hold copies as they are unsurpassed by any other work. You may also discover why Child skipped the music. He would have never completed his objective to catalogue the ballars by literary content had he enlarged the taxk.