These are the lyrics to a 1980's TV advert by a company called Libby's. The advert was for a fruit drink product called UmBungo. The drink was good, and is still availible in parts of the UK.
The lyrics are courtesy of :-) An MP3 of the full song, and a MOV of the first advert are also availible there.

The can also be found below, but please onlw get the from here if the links to the umbongo site don't work!

Way down deep in the middle of the Congo,
A hippo took an apricot, a guava and a mango.
He stuck it with the others, and he danced a dainty tango.
The rhino said, "I know, we'll call it Um Bongo"
Um Bongo, Um Bongo, They drink it in the Congo.
The python picked the passion fruit, the marmoset the mandarin.
The parrot painted packets, that the whole caboodle landed in.
So when it comes to sun and fun and goodness in the jungle,
They all prefer the sunny funny one they call Um Bongo!