>Calling any modern regurgitation of Glass's very-listenable minimalism "avant-garde" is misleading and shuts out the contemporary listener to an entire world of avant-garde music - much of it, very listenable.

I'm not convinced that someone simply using the word "avant-garde" shuts anyone out of anything.

For example, if I type "Taylor Swift is avant-garde" did this suddenly shut out listeners from an entire world of pop music?