Yes, the electron vibratory forces would be very small. But, since the electrons are inside the wire and is the signals transport system and the signal is flowing through-around, however- them, one could posit that this vibration would have an outsized vibratory effect that cannot be counteracted by any means. If the electrons are vibrating, and the audio signal is passing through them, how can it not cause the audio signal to vibrate? This could be another reason why your music playback system sounds so clear to you. Less wire and cables, less electron vibration in the signal path....