Drummer Mick Fleetwood and bassist John McVie
Though Fleetwood Mac’s rhythm section may have provided the underpinnings of its name, Fleetwood and McVie held little sway over the direction of the band’s sound. Since its late-60’s inception as a hardcore UK blues duo, Fleetwood Mac changed line-ups-- and genres-- more times than care to be counted, with several of its members succumbing to mental illness or the allure of solo careers.
Source: All Music Guide, 1/1/1900