I had heard about it long ago these days I hear about it again. We are talking about a "harmonic scale" in and around Piacenza (my town). It seems that it was used long ago but has since “disappeared” I tried to search for news but the only thing I found was that there was a person (unfortunately he died recently) who had an accordion with this type of intervals. Moreover, he was the father of a friend of mine. I knew he played and was a great fan of accordion and typical folk songs. The question is, looking at the videos, since many of you are experts, would it be possible to understand at least a little bit what this scale was like?