harmony
That instrument is called a Metronome.
This is generally called a jukebox musical.
There really is no technical name for someone who impersonates musical instruments and machines. They would simply be called an impersonator of musical instruments and machines.
A numbered musical piece might be called a concerto, an opus, or a composition. It could also be called a symphony.
It is known as an Octave (a musical scale of eight notes).
This is called Euphony, the use of pleasant, soft sounding vowels, to create a pleasant vibe, as a 'host of golden daffodils' would.
A combination of pleasant sounds is called harmony. It is the pleasing arrangement of musical tones that agree with each other.
Sounding board
In a stringed musical instrument, the part that vibrates in a resonance with the sound waves produced by the strings is called the sounding board.
That instrument is called a Metronome.
The first Skulduggery Pleasant book is just called 'Skulduggery Pleasant'. It was retitled "Skulduggery Pleasant: Scepter of the Ancients" for US release.
A sounding
musicalS are called musicalS because they have MUSIC in them making them MUSICAL
Its just Skulduggery Pleasant
A musical foot is called a "spondee"
its called skulduggery pleasant: playing with fire
A pleasant complex sound is a consonance, an unpleasant is a dissonance