I just tried this with a melody I've had stuck in my head for days - no results. Then I tried "Happy Birthday" and got three results: "Las Mananitas" by Canticos "Iyi Ki Dogdun Melissa", by Eser Ulun "Iyi Ki Dogdun Zarife", by Eser Ulun I'm no Pavarotti, but I can sing on pitch and have played the violin for 40 years. EDIT: Heh, "Iyi Ki Dogdun" is Turkish for Happy Birthday, and the links would have taken me to YouTu…
I'm not sure how many people think of hum the same way. I've noticed lately some words being used slightly differently than I am used to (the one coming to mind right now is "giggle" in a story that in context I would interpret as meaning "chuckle"), and at this point it's happening enough that I'm not sure if there's a shift in perception of these words or if I just always interpreted them more narrowly than they were intended.