Do you have any kind of keyboard, or maybe an acoustic guitar? It greatly simplifies figuring out the key and chord progression of a song if you have an instrument that can play all keys and all chords (and notes).
I have accordions in lots of different keys, but it is slow and clumsy to identify the key by switching accordions around until I find the right one. And that is if I even have the right one. (For example, I hear more and more songs recently that are played on a G single row, often in the key of D. But I don't have a G box.) With my acoustic guitar or keyboard, I can find the key and chord progression in seconds.
I'm not yet used to all the different patterns for getting notes out on the triple row. There's more options than a single row and I'm not yet where I can hear positions when someone is playing a triple row, unlike on a single row (sometimes).
i think we used to do that in C on the F row [2nd position]
but i have never heard chubby;s version
it was just where the guitarist wanted to sing it, or it was a compromise between his voice and available accordion keys i had at the time, and his guitar solos