I regret not recording it, I tried looking up what species it was, but people are saying its synthesized. I can say that its plausibly not. I heard them in the state of Washington. Their chirps echo as they talk to each other, just like the song. I thought it was some sort of after effects, but no, it was trippy.
Near here (link deleted), and it was yesterday.
Amazing! Were you in a woodland, field, or some kind of water area?
Just relistened to the track. Pretty dope that you heard birds doing that!