Dulci, Bertrand Harris Bronson's The Traditional Tunes of the Child Ballads, Vols I-IV (New Jersey: Princeton University Press, 1959), is a compilation of tunes to the ballads collected by Francis James Child. Since Child collected only texts for the ballads, many consider Bronson the essential source for the tunes to which they should be sung. As mentioned above, it's very rare, and the few copies that do turn up in used booksellers' collections (and EXTREMELY rarely does a complete set appear for sale) are quickly snatched up at high prices.