In early 1970, Fleetwood Mac recorded three concerts in Boston with the notion of releasing a live album. Within weeks Peter Green had gone AWOL, throwing the band into disarray. The album was shelved. Some of the material later crept out on vinyl in the 1980s. Now comes the first in a planned three-CD series from those performances. “Black Magic Woman” and “Green Manilishi” bookend this first set, and in between there’s much mundane blues jamming, including an unforgivable 25-minute version of “Rattlesnake Shake”, making it for collectors only.