The thing about a long-lived, different-membered band like Fleetwood Mac, is that comparing different line-ups is an apple-to-oranges comparison. The original Peter Green-lead version was a pure Chicago Blues Band, while the Kiln House album is heavily 1950's Rock 'n' Roll-infused. When Buckingham and Nicks joined, Fleetwood Mac became a Pop Group, and I mean that in the positive sense (Pop is often used in a pejorative manner. Not I---I love Pop music. Sophisticated chord sequences, beautiful melodies, harmonies, and counterpoint---Brian Wilson, Bjorn & Benny---the B & B of ABBA, the Soul music of the 1960's, etc.). Buckingham & Nicks are about the songs, first and foremost---Pop.