Females love anything that rhymes, especially if they can attach a fictional y on it (increasing the number of rhymy words) so everything must therefore have a rhyme. Instinctual for toddler training, I guess. Males think rhyme is mostly a tool for attracting females with (every singer says they got into showbiz for the girls) so they could make children. Humans are real basic.

@rainmanjr I'll have to do a bit of research on the that but I guess right, court entertainers use to compose ballads for the ladies in waiting while their knights went off to fight in The Crusades.