My Metronome’s Name is Sauron (apparently).

And so Metronome, enemy of rubato-loving peoples of the Earth, was defeated.  The Battery passed to the Trash Can, who had this one chance to spontaneously combust and destroy evil forever.
But the hearts of trash cans are easily corrupted, and the Battery of Power has a will of its own.  It betrayed the trash can–to his death.  And some things that should not have been forgotten were lost.  History became legend.  Legend became myth.  And for a time and a half, the battery passed out of all knowledge.  Until, when chance came, it ensnared another bearer.
It came to the creature Charger, who took it deep into the tunnels of the AC Socket.  And there, it consumed him.  Uncertainty crept back into the ticking of the time-keeping world.  Rumor grew of a shadow, whispers of a nameless fear, and the Battery of Power perceived its time had come.  It abandoned Charger, but then something happened that the Battery did not intend.  It was found by the most unlikely person imaginable: a singer.
For the time will soon come when singers will shape the time-keeping fortunes of all.