And I think this is where the discussion potentially disintegrates: Greatest in terms of Music and in terms of Influence. Like you, GM and FA, I think WYWH is musically more accessible; however in terms of influence and range, DSOM is vastly richer.

Mebbe this oughta be put into a different thread (I have considered it fodder for a blog entry, to be honest), I always had a soft spot for Ummagumma. While DSOM and WYWH (and even The Wall) were significant albums in their own right, Ummagumma was important for PF's rare displays of diplomacy. Compare it to future Waters driven albums (The Final Cut) and Gilmore fare (Momentary Lapse of Reason), Ummagumma gave wide berth to the individual members and presented the band in cohesive brilliance (Astronome Domine, Careful With that Axe, Eugene).

Back to Earth, now, Yes was certainly one of the top performers but I think they still command a cult crowd that surpasses main-stream appreciation and impact (this is a compliment, BTW). As for David Bowie, he belongs to a different discussion altogether, describing Greatest Rock Musicians (individuals). As such, he certainly deserves a place on Mount Olympus....

Finally, just call me aa (got rocks in the head, ya know!)