A group of fairly balance young chaps led by Neil Innes and Vivian Stanshall, who spent the latter half of the Sixties making beautiful music together. Albums include Gorilla, Keynsham, Tadpoles, The Doughnut in Granny's Greenhouse, and Let's Make Up and Be Friendly.
Their biggest success was the song "I'm the Urban Spaceman". Also known as the Bonzo Dog Doo-Dah Band.
Note for Americans : They're a bit like Frank Zappa, if that helps.