Both Uses of

cacophony
in
The Magic Mountain

And after he had taken a sip, he would continue as follows: restraining further conversation with one hand, he created silence the way a conductor hushes the cacophony of instruments being tuned and with a commanding, cultured gesture summons his orchestra to begin the concert; for his large head with its encircling flames of white hair, with its pale eyes, deeply creased brow, long beard, and exposed, pained lips looked so unquestionably imposing that everyone obeyed his gesture.†
Chpt 7.2

Water plunged in a maddening cacophony of every conceivable noise and tone: thunders and hisses, howlings, boomings, tattoos, cracks, rattles, throbbings, and chimings—you truly could not hear yourself think.†
Chpt 7.5 *

Definition:

loud confusing disagreeable sounds