You lucky bugger, I was sadly too young to see the Robert Wyatt era Band, afraid I lost interest in them after he left & they became more & more noodletastic.
Led Zeppelin III, play it far more often than any of their other studio albums with the possible exception of Physical Graffiti.
They got a lot of stick at the time for not rehashing the first two albums as they went a bit folk/acoustic/weird on the second side but I Iove it.