The sound came across to the listener as dissonance. Quarter tones, or half a semitone, were also used. They are a type of microtone. Béla Bartók and Charles Ives both used microtones in their ...

Collectors often pay the highest amounts, around $10,000, for Georgia quarters that were molded from an experimental mix of metals with a gold or green hue. The coin disks, known as planchets, were ...