I love it! Philosophy! When it comes to composing or performing a piece of music, I don't want to use measurements-- it's about perception all the way.
That doesn't stop music theorists from analyzing things ex post facto. Whether they are analyzing the notes written in the score (what the composer does), or measuring tiny variations in rhythmic performance, lots of folks do that.
A guy named David Cope is working on software that generates tonal compositions:
This doesn't interest me a whole lot because, again, it's all about perception. But a lot can be analyzed.