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 the French poem Le Thé (Tea) by Théodore de Banville
with an mp3 recording. After the poem you'll find an
English translation.
MP3 of Le Thé
Le Thé
Miss Ellen, versez-moi le Thé
Dans la belle tasse chinoise,
Où des poissons d'or cherchent noise