The Robert Johnson STributee: Robert Johnson. Most people know Peter Green as the visionary guitar hero behind the original, blues rocking version of Fleetwood Mac, but he's pursued a solo career ever since departing the Mac, and THE ROBERT JOHNSON SONGBOOK brings him back to his roots. Covering the songs of his early influence Robert Johnson, Green wisely avoids trying to rock things up, opting instead for an appropriately lo fi, acoustic (if not always solo) approach.