It's been a while but baying hounds is pretty high on my list.

And for some strange reason I like hearing the occasional tinkling of the bell on one of the guy across the rivers goats.
Reminds me of the stories I've read about the lonely Basque sheep headers love of the sound of the bell whether.

A couple dozen Hummers buzzing my feeders and the Quail calling and Turkeys gobbling around my place in the spring.