Eldartford,
We're in the world of different events and subjects. We're in the world of a different languages.
Music is also a language or sonic form of such. Every tact is a word and every group of such may be a "phrase" or "sentence" not neccessarily sonic exploration or an exersise. There's not only the Blue Danube or Nutcracker, there's an industry, machines, trains etc...
I personally like when I can distinguish "phrases" or "sentences" there; reprising in musical compositions is a big +. For example Phillip Johnston's music to the movie "Unknown" falls onto that category. Despite its being played by 6-piece band I wouldn't categorize it to a jazz since there's too much order rather than an improvisation or blasting solos of every musician.
Start understanding Prokofiev and Shostakovitz first and than try Alf or Gorecki...