Dylan comes from a rich tradition of those who have recycled tunes and put them to their own use. Some have even taken older pieces, lock, stock, and barrel and put their names to them, taken out copyrights and pocked the royalties. Dylan pretty much took tunes, many of which were not overly done. Usually very nice tunes that deserved to be heard again. There are those who give no thought to the "tune" getting new life when they hack away at the person who gave them new life. Dylan tends to get rougher treatment than Woody and A.P. and others.