Great Album Covers No 4 Atom Heart Mother

When I was a schoolboy around 1970, it was de rigueur to carry albums by the latest 'heavy' groups around the school all day, visible under your arm. I guess the idea was that you were swapping yours with someone else's, but it was being seen with them that was important. "A Friesian cow: heavy man!" I've always liked this Pink Floyd album, with its brass sections and choirs, though it tends to divide opinion.