A beginner question here. I have tried a few sets of strings now and have reached the obvious conclusion that the type of string, and the age of the string also has an effect on the tone. I am curious why this is. A string is some wire that is vibrating in a magnetic field produced by the pickup. Does the vibration of the string change as it gets older? Do different makes of strings vibrate differently? What role does the string construction play? Can somebody point me to a good explanation?