I think you also have to consider that the band didn't do much in the way of background / harmony vocals on studio tracks in their earlier years either (some on Kiln House, mostly Danny Kirwan on Jeremy Spencer's songs), so they had little history of doing it. And if I recall correctly, some of the early attempts at harmony vocals on live recordings after Christine McVie joined the band are not that great. Seems like it took them awhile to get it figured out.
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