Music is made up of a lot of frequencies that by themselves (like a 20khz test tone) may be inaudible, but because it's music, they have a large effect on the sound. High notes can have higher overtones that sweeten the tone overall...most likely why analog (and live music) sounds different than digital, and why a good subwoofer can "charge" a room and make music that otherwise seems to lack low frequency information (mandolins?) sound more natural.
