This is a short song sung by Homer in “Moe'N'a Lisa”. The song is meant to be read as a poem.
[Homer Simpson]
There once was a rapping tomato,
That's right I said rapping tomato,
He rapped all day from April to May,
And also guess what, it was me.
The Simpsons released Rapping Tomato on Sun Sep 30 2007.