I would say it's ability to evoke obscure emotions. Without words or visuals, the meaning isn't concrete. There's a wide area of interpretation to a listener, but not random, there's commonality to the meaning of good music.
Because of the obscure emoting of music, it's good for creating atmospheres: church services, weddings, funeral, festivals, dances, movie soundtracks. Even something personal like an atmosphere for driving your car, taking a walk, or to just sit there and be absorbed by it.
I've met quite a few people who think music helps them do their job (zoning out/focusing better), but I suspect it's a load of crap. You're either ignoring the music, in which case it might as well not be on, or listening to the music, which means you're not focused on the job at hand.
...The discipline of learning an instrument would be valuable to anyone. Whether or not any sort of career arises, there are lessons to be learned in problem solving, goal setting, work ethic, overcoming fear, memory, imagination, the simple enjoyment of playing and the satisfaction of achievement.