Music, and the learning associated with it, is more than just a hobby that one learns for thirty minutes a week, assuming the opportunity is there to take music lessons.
Music, accurately put, is an education. An education not simply limited to music itself, but rather one that incorporates all sorts of things that would be taught at school, only under different banners.
Music, for example, is a study in science. It is exact and specific, and demands exact acoustics. Think of a conductor of an orchestra, and imagine the score of the music played, a graph indicating frequencies, intensities, volume changes, melody and harmony, all at once, and with exact control of time.