He rewrote Anathea, Dick...something bards have been doing for thousands of years. The version of Anathea you are referring back to was probably itself a rewrite. :-)

I rewrite old ballads too sometimes. Go crazy about it...

May you, Dick Greenhaus, find yourself locked in an underground vault with nothing to listen to but Bob's entire catalog of songs (rewrites of old folksongs included)...until Paul Anka records a duet with Maybelle Carter.