rhapsodize over (someone or something)
To speak or write about someone or something with extravagant, unbridled enthusiasm. John won't stop rhapsodizing over the book he's reading at the moment. I nearly makes me not want to read it! Janet's previous employers rhapsodized over her in their reference letter, so I'm pretty confident we're making a good decision.
rhapsodize over someone or something
to go on and on about the virtues of someone or something. Young Thomas likes to rhapsodize over Francine, his girlfriend. Please do not rhapsodize over this poem anymore.