Genesis performing their epic, seven-movement progressive rock sonata “Supper’s Ready” onstage at Shepperton Studios in 1973.

“Old Michael went past the pet shop, which was never open, into the park, which was never closed, and the park was full of a very smooth, clean, green grass. So Henry took off all his clothes and began rubbing his flesh into the wet, clean, green grass. He accompanied himself with a little tune - it went like this…”

In a sense, this is the ultimate example of what they did during the Peter Gabriel era. There’s a detailed Wikipedia page about this song, which took up almost all of side two of their Foxtrot album.