Oh, its definately an attempt to get white suburban kids, many of whom thought Eric Clapton WAS the blues, to hear some originals. It is a shame that the greats like Muddy and Wolf didn't get that recognition on their own.
Funny story: When I got married my wife was looking for a wedding song and she came to me with this "great" Art Garfunkle song, "I only Have Eyes For You" under the assumption that Art had written it. Yeesh! I have a new wife now btw.