Oral Tradition and the Author of a Corrido - Blog Prompt

Unlike the troubador songs, which we presume to have had singular "authors," texts in oral tradition are sometimes collectively composed. In the case of the Corrido of Gregorio Cortez, we cannot name a single author but instead attribute it to its various singers.  How does collective or anonymous authorship of a piece effect our relationship to it as an audience? Does it gain or lose in meaning and significance? Does it challenge or ease our job as interpreters? Is it significant that in traditions such as the corrido, early performers seem to have had the latitude to "edit" the text (that is, making deliberate changes to names, events, and images in their performances)? How important is it  that such oral texts must compel other performers to take them up ... or they are forgotten?