Spot the obvious mistakes:
There are two main versions of a pick-up: a single rail, and a humbucker. There are many versions of each kind. A single rail pick-up has six bar magnets used to read the sound. They have a very bright sound.
The Humbucker pick-up was invented by Seymour Duncan to eliminate the fuzz that was prominent in older Single rail pick-ups. They are twice as wide as single rails. They contain a single wire that is wrapped around two sets of six magnets. The wire is used to stop the buzzing (or "buck the hum" as Seymour said it).
