There's something about a yellow bird.
When my son took piano lessons, we encountered the popular Haitian folksong "Yellow Bird." I thought it was a very catchy tune. I've talked him into playing it for me on the guitar. This is a guitar someone gave him. I think Caleb only needed to get nylon strings and maybe pegs to make it playable.
Turn the sound way up; it is not a loud recording.
"Yellow Bird" is a good whistling song, and I find myself occasionally whistling it, especially when I'm outside.