A techno-taxonomist, Lila,
Was explaining some telephone phyla:
'There's “-Joke” and there's “-Ride”
'And then “-Song”; all inside
'The umbrella division of “Dial-A.”'

A daring detective named Oliver
Killed a perp with his trusty revoliver.
So he went to the church
Where his soul's blackened smirch
Was redeemed by a priestly absoliver.

Based on the suggestion: "Lila and Oliver"