Here's a little sample from HMV's on line CD sales.
People who bought Robert Johnson also bought:
Madeline Peyroux
BB King
Bessie Smith
Robert Cray
Taj Mahal
Richard Thompson

People who bought Seth Lakeman also bought
other Seth Lakeman CDs
Nerina Pallot
Jamie Cullum
Madeleine Peyroux
Richard Thompson


This I find very suggestive. Firstly, who is Madeleine Peyroux, that both Robert Johnson and Seth Lakeman fans buy her records? This girl needs watching, I must look her up. Also, Richard Thompson looks magnicently embedded in the public imagination if he is bought by fans of Robert Johnson, and the Boat Band, and Seth Lakeman. Surely a remarkably disparate group of people.