You walked right into that one.It's an unexplained phenomenon. I am not being glib when I say that.
Woody Allen specializes in, and plays, traditional New Orleans jazz. He likes a musical style that's 100 years old. You like a musical style that's 40+ years old.I also feel sad for people who live in the past, whenever their favorite traditional jazz was recorded. They kind of remind me of Woody Allen who always had old time music in his movies.
Trying to make a distinction between those two things seems like splitting hairs to me. The past is the past.