As far as odds and ends packages go, Original Fleetwood Mac (1971) is an undeniably strong collection culled primarily from the band's first incarnation, featuring John McVie (bass/guitar), Mick Fleetwood (drums), Peter Green (guitar/vocals), and Jeremy Spencer (guitar/piano/vocals). As evidenced by the material, this quartet are an unmistakably blues-based combo. Early on they distinguished themselves as not only interpreters of traditional fare, but skilled composers, especially Green, who penned the vast majority of these selections…