And a quote regarding influencing of metal:

While the Mac is revered for its early material such as “Black Magic Woman” and “Rattlesnake Shake” and the glorious instrumental “Albatross,” Spencer points out that the music had already begun to move in strange directions with Peter Green’s acid-soaked 1970 U.K. hit “The Green Manalishi (With the Two-Prong Crown).”

“I wasn’t keen on the direction we went into with ‘Green Manalishi’ and all that, which led to the birth of heavy metal,” Spencer says. “It’s such a shame that metal sprouted from that stuff. Death-metal bands give credit to Fleetwood Mac today.”