Perhaps within the next hundred years, science will perfect a process of thought transference from composer to listener. The composer will sit alone on the concert stage and merely 'think' his idealized conception of his music. Instead of recordings of actual music sound, recordings will carry the brainwaves of the composer directly to the mind of the listener.
The composer must bear in mind that the radio listener does not hear music directly. He hears it only after the sound has passed through a microphone, amplifiers, transmission lines, radio transmitter, receiving set, and, finally, the loud speaker apparatus itself.