This one’s going to be a challenge. In the 1990s (I can’t recall hearing it more recently), there was a piano solo, mostly played during public service announcements but I also heard it on PBS nature shows a couple times. It is NOT “Trois Gymnopedies”, “Sirius”, or any other title that’s been suggested. It starts with several notes played in the treble/right hand range, and then the left hand joins in after a few seconds. It was one of those tunes that probably wasn’t all that hard to play, but somewhat more challenging to play correctly. Sorry, I can’t post an audio link, and you wouldn’t want to hear me try to sing or hum it anyway.
Even Lord Vinheteiro hasn’t played it, to my knowledge.