Observation is for the loudest call in the recording. There are some cardinal and maybe Swainson's Thrush calls in the background, but this is for the louder call with the 1-2-3 cadence. Merlin would not even take a guess as to what it was. The bird was in someone's backyard trees that lives along the West side of the park in about the center of the park. I would love to know what this bird was.