Mozart, as well as, other great composers are all part of a thing called classical music. Classical music doesn't appear to be as popular as it once was. It is because of the obvious, and the obvious is this, classical music is a very long type of music and compared to its digital alternative.
It fails in comparison. Because, for one thing, digital music is shorter and something busy people go for as opposed to the more extended and drawn out version which is classical music.