Harmony-central has an excellent set of instructional videos up on it’s website that feature Mr Paul Reed Smith describing the components of a good guitar sound.
Now don’t jump to conclusions that since it’s Paul Reed Smith it’s a promotion of PRS guitars. He breaks down all the components on a white board and goes into each component of the signal chain. Not only does he come off as a great speaker in these vids but he presents information which would be good for many different levels of guitar players. The links to each of the 3 videos are below.
You can check out all the other instructional vids at the Harmony-Central site here.