Reduplications are words or phrases that contain a
duplicated element. An example is the phrase "riffraff".
The two parts of the word are almost the same (i.e. "riff"
and "raff"), but they have a small change (the vowels).
When you have a rhyming reduplication, the duplicated
element rhymes with the original element in the phrase. A
good example is "lovey-dovey".
I started thinking about rhyming reduplications recently...

Here's a lovely poem about The Wind by Robert Louis
Stevenson with a couple of mp3 renditions.
MP3 of The Wind
The Wind

I saw you toss the kites on high
And blow the birds about the sky;
And all around I heard you pass,