Arthur Edward Johnstone,
Instruments of the Modern Symphony Orchestra…
(1917)
“ The clarinet comprises four registers, which can be blended without perceptible break by the skillful performer. The first or lowest is dark and ominous. The second consists of four or five dull, weak, notes of inferior quality. The third or medium register is of singular beauty, combining nobility, tenderness, and that limpid quality for which the clarinet is distinguished. ”
