Well, I'm 56 so I'm pretty familiar with almost all, if not everyone of those tracks. Came of age musically in the late 70s early 80s and began playing the drums around 1982. I would still say the bass would be on the lean side in those tracks. Not non-existent, but certainly not full at all. Now there would be sections in Dark Side of The Moon, during Time and Money where the bass became more apparent, but I have to say that, for my tastes, lean would still describe it. Generally.