It's a question of musical evolution, and there's a lot to be learned from history. Part of the blame goes to radio. There's no jazz, classical, or big band. Madonna, Guns 'N' Roses, Public Enemy, Marky Mark. Sometimes even that can be boiled down to one or two of the artist's singles.
Music has, sadly, become a passive medium.
People hear music, but rarely listen. Anything that's not rock, pop, or rap is delegated to smaller stations on the dial, and can't compete in the larger market. Another personal anecdote. A few years ago I found myself in Scotland. One night I entered a small pub and started talking music with the locals.