There are many evils to strict definitions, which one can't do precisely anyhow. But with no definitons one is left with little to guide one to find something in a mountain of data.

My ideal, which I don't really know how to do, is to have a many sided box with flexible walls, each with some kind of label on it, [something like Bert's? (darn, I can't check the other thread from here) categories on the other thread] and for each song under consideration see if we can stretch the wall a little one way or the other to reasonably include or exclude it. 'reasonably' here is the catch, since one mans logic is often another's chaos. That will be where the really heavy fighting starts. I've got a son who's title has recently been assigned to him as 'Cryptological Engineer'. He is a computer scientist who specializes in implementing encryption algorithms in software for data security. If I didn't know what he did, I probably would never guess what his title meant. (His escape is to do juggling gigs on weekends, because he could never sing or play an instrument any better than I, but he's a lot better mathematician than I am.)