We have quite a lot of rhymes that start with " On the top of a mountain there was a ...". It must be an interesting beginning for a story. This one sounds like a tongue twist to me. Try it out for yourself.
gao1gao1 shan1shang4 yi4ke1ma2,
you3ge4 zhe1liao wang3shang4 pa2.
wo3 wen4 zhi1liao ni3 shang4 na3?
ta1 shuo1 ke3le yao4 chi1 ma2.
On the top of a mountain
There was a hemp.
And up it a cicada was climbing.
I asked the cicada: "Where are you going?"
He said he was thirsty and wanted to eat the hemp.