In literature style and content are inextricably linked and I guess it's the same in music, except we're rarely explicit about content in music. The exceptions are pieces which are purposely descriptive - a jazz example would be Tadd Dameron's Fountainbleau, where the music depicts the swans bobbing on the lake, etc. People who are close to a type of music are usually unaware of its "content" - a lot of pop music is about teenage angst to my ears, but its fans wouldn't be aware of that. To turn again to jazz, a guy once told me he liked jazz and named Johnny Dankworth and Cleo Laine, but when he heard me playing a Cannonball and Coltrane disc (Cannonball Adderley Quintet in Chicago), he said "I don't like this neurotic stuff". This was a "content" I hadn't been aware of; if I'd never heard music like that before, I might have heard that in it.