No offense, but this is kind of a silly question.

Personally, I've found the subject very usefull... not so much at lower level classes though. Other people will have different experiences of course.

But am I supposed to explain how a field is useful to you? Possibly it's useless to you. I've had the same debate with my brother ... except he always argued that Math was useless (he's more of an artistic-minded person).

Art/Music might also be useless for you as well. I have no idea what you are even trying to do (do you want to make widgets in a sweatshop?)

What do you think is practical?