"Perfect counterpoint" refers to a musical technique where two or more melodies are played or sung simultaneously and complement each other harmoniously. Full definition
I love Ayn Rand's over-the-top objectivist viewpoint as the perfect counterpoint to the «bleeding heart liberal humanist» (as Al wrote) that is Jesus in the Bible. (religion.blogs.cnn.com)
The maple syrup with its sweet caramelly flavor, a little cayenne for heat, the smokiness of the paprika, and lemon juice for acid — it all comes together to make the perfect counterpoint to the flavor of the fried Brussels sprouts. (justalittlebitofbacon.com)
They're not super sweet by themselves, which makes them the perfect counterpoint to this luscious cherry glaze. (acalculatedwhisk.com)