Former industry writer and PR man Paul Merry has boundless knowledge of the blues and rock & roll, and their correlated history and development. He’s written a book, and keeps a blog on the subject. There’s a lot of interesting reading there, with some influential but now obscure artists, and covering from the slave trade to the blues rock explosion in the 1960s. There’s a lot I didn’t know, and I’m sure there’s something you can learn from this trove of information.