1. Peter Green—Oh Well (Fleetwood Mac, Then Play On, 1969). Green is still alive, which is sort of amazing given the Class As and the schizophrenia. He replaced Eric Clapton in John Mayall’s Bluesbreakers, and did a better job. Green is pure blues here, and his most recent band, Peter Green’s Splinter Group, put out some fine blues albums in the 1990s and 2000s. After he left Mayall’s band he founded Fleetwood Mac—which he also left a couple of years later, but not before putting out the classic Then Play On. I recall seeing an interview with B.B. King at some point where he said the only guitarist that ever scared him was Green. Green has a very pure sound, much like what Mark Knopfler developed. Green got there first.