Sounds like a living metronome that hates being predictable. Try humming the tune, write down the intervals each time you hear it, and see if the pattern repeats in a higher octave or with a different rhythm. If it keeps shifting, maybe it’s encoding something like a prime‑number series in the pitch steps—think of the Fibonacci, but in notes. Grab a guitar, record yourself, and play it backward; sometimes the hidden message shows up in reverse. Good luck, and remember: even the strangest melody has a groove that, once you find it, you can’t unhear.