Hi Bill,
You mentioned "I’m open to any categorization to help define this era- what do you suggest?" I'd suggest a music lover might consider that NO categorization other than Music might be a way to open listeners to all music/sounds they may enjoy. In my experience, categorizations and genre labels may serve to limit listeners exposure to music they may enjoy. We all rembember the Duke Ellington quote; "There are only two kinds of music, the good kind and the other kind". Each listener has the ability to decide on the value of any music they encounter. Ellington didn't even care for the use of the word jazz. Let's consider opening up the possible enjoyment of a wide range of music by canning the labels/categorizations/genre identifiers.