It is a widely recognized fact that equal temperament gives inaccurate intervals (particularly, the major third). People usually ignore it, but some people try to actually fix this.
I have heard that one easy way to improve your sound is flattening your B-string - this is claimed to improve how the "cowboy" chords (Am, C, D, E, G) sound.
Why does it work?
What other adjustments to string tension could I do? How does it depend on the key(s) I am going to play in?
(I am talking about the regular 6-string guitar with 12 frets per octave, without altering the frets themselves in any way).
