Hey you know what?
I forgot about what was my real very own "first instrument".
It was a plastic "Flutophone" -- a late 40's or early 50's marketed thing that was basically a Recorder made of plastic with more of a police whistle type mouthpiece and a large bell at the bidness end.
Worked fairly well for figuring out songs in the key of C that were based on the Major Scale.
--Mac