Reproduction of notes Ability to reproduce accurately by means of a tonoscope the vibration rate of designated notes depends partly on the ability to image the correct note and partly on one's technique in singing the imaged tone. On the whole in these tests the abilities to reproduce and to identify notes correctly run parallel. The experiments in singing the notes took place at the end of a year's practice in identifying notes. The earlier experiment had laid emphasis on auditory images and must have aided somewhat in this later experiment.