The Unheralded Listener

Have you ever had a conversation with a mockingbird?  Good luck.
It surely would be a one-sided affair, for day and night this mimic sings.
His playlist is an endless loop of annoyance, or so it seems.
But when I consider his songs, I wonder?
How did he learn to carry the tune of the hawk, the robin, the finch, or the crow?
And isn't it amazing that he can even mimic a dog or a siren or a train?
How can he sing what he hasn't heard?
Maybe he is a better listener than I thought.