Keith Richards has always had fairly conservative tastes, in that he stuck with what he knew (which is his prerogative). Mick Jagger tends to go for what is 'trendy' at the time. They meet somewhere in the middle.
As an aside, I played disc 1 of the 2007 version of The Song Remains The Same and thoroughly enjoyed it. 'The Rain Song' is superior to the studio version, IMHO. I think this newer version has more of a sense of occasion than the original album did. But I think this is the point where Plant's vocals showed signs of strain, he pretty much avoids high notes altogether.
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