Fleetwood Mac were a band of many incarnations, first through their 1960s origins with guitarist Peter Green, drummer Mick Fleetwood, and multi-instrumentalist Jeremy Spencer, to their more famous Rumours era, which incorporated the siren Stevie Nicks and virtuoso Lindsey Buckingham as a package deal in 1974. The British-American band formed from the ashes of a blues project that the eccentric Peter Green had founded (he was already one of London’s most famous blues guitarists of the 1960s). Fleetwood Mac would change with the times, having as many as 18 different members over the years — while the band’s style changed into an ethereal, folk-inflected pop group that catered best to the talents of Buckingham and Nicks.