Danmarks gamle Folkeviser is a collection of (in principle) all known texts and recordings of the old Danish popular ballads. It drew both on early modern manuscripts, such as Karen Brahes Folio, and much more recent folk-song collecting activity. It was started in 1853 by Svend Grundtvig. During the nineteenth century, Axel Olrik was also heavily involved, editing volumes 6-8. The work was continued in the twentieth century by new generations of folklorists, and in 1976 comprised 12 volumes, containing 539 ballad types, often with many variants of each type.