It's a damn good observation. Birdsongs are relatively rigid recordings that play the same way every time. Each bird makes small variations, but the theme is recognizable.
Earworms (what I call the mental jukebox) are also rigid recordings with variations. Does our earworm mechanism occupy the same brain structure, or derive from the same gene set, as the bird's standard song? Is this another bird-human parallel?
The current icon shows Polistra using a Personal Equation Machine.