You're right, Johnny, I guess that we all know that music is our primary (or secondary) concern. But curiosity kills me.:))

Ok Sorcha, it is reasonable to expect another viable explanation, this happens very frequently in science, and sometimes drives us to new discoveries. What would be really misguiding is the line of reasoning that says "if this could hardly be done by humans, then it should have been made by the aliens" (what neither you nor me are saying).

Thanks Naemanson, we cross-posted above !

Un abrazo - Andrés