From The Enigma
NPL Magazine
December, 2017
NEWROW

Ignoring the final (s), the last two keywords in this flat are the exact reversals of the first two.

Songs are made by _ _ _ _ s and _ _ _ _ s.
My hearing's low,
So, this I know:
I can't hear but _ _ _ _ s and _ _ _ _ s.

HINT:
The first two keywords are a certain animal and a poet.

Answers:

BIRDs and BARDs
DRIBs and DRABs