by Richie UnterbergerEric Clapton is usually thought of as John Mayall's most important right-hand man, but the case could also be made for his successor, Peter Green. The future Fleetwood Mac founder leaves a strong stamp on his only album with the Bluesbreakers, singing a few tracks and writing a couple, including the devastating instrumental "Supernatural." Green's use of thick sustain on this track clearly pointed the way to his use of this feature on Fleetwood Mac's hits "Albatross" and "Black Magic Woman," as well as providing a blueprint for Carlos Santana's style. Mayall acquits himself fairly well on this mostly original set (with occasional guest horns), though some of the material is fairly mundane. Highlights include the uncharacteristically rambunctious "Leaping Christine" and the cover of Freddie King's "Someday After a While (You'll Be Sorry)."