Anyone who loves rock and roll music has probably dreamed of ways to turn that passion into a paying gig. Paul Scharfe is following just such a dream as founder and CEO of Rock Square, a global marketplace and social network.

Even as the music industry seems to be inching closer to an all digital world, record labels are finding ways to entice fans to buy physical product.

He’s no international man of mystery, but Gus Cannon and his alter-ego, Banjo Joe, were double agents of sorts at the Paramount and Victor record labels.

In the new book “Put The Needle on the Record: The 1980s at 45 Revolutions Per Minute,” author Matthew Chojnacki shines a light on the artistry of picture sleeves. Here’s a sampling.