The "tone chain"

[PRSMan]

http://www.harmony-central.com/theater/theater_instructional.html#

Under the "Instructional Video List", launch the video entitled "Paul Reed Smith...".  It's Paul Reed Smith talking about what leads to good tone, and what the "tone chain" looks like.  It's stuff that we all already know, but IMO, his talk is very well summarized and objectively presented.