uirapuru is amazing. I once unwittingly attended a concert -- it wasn't really a concert, the bird just started singing because it's what birds to -- and all other birds went quiet so that they could listen. I know it sounds odd but I was *there*.
I don't know if it's the same uirapuru, there are either many of them or just one depending on who you ask.
If what you heard was merry to you and you felt such a rapture, maybe it doesn't matter how many uirapurus are out there, juts that you can listen to it. Maybe the song feels different every time.