Wikipedia
Musical clock
A musical clock is a clock that marks the hours of the day with a musical tune played from a spiked cylinder either on bells, organ pipes, bellows, combs and even dulcimer strings.
One of the earliest known domestic musical clocks was constructed by Nicholas Vallin in 1598, and it currently resides in the British Museum in London.
Usage examples of "musical clock".
So when he was last there, in July, Romanelli had the imperial consul, an employee of his, put milord to sleep by having him concentrate on the operation of a musical clock, and while he was asleep my brother placed a command in milord's mind, under the thinking level so he wouldn't be aware of it—.