I have two steel-string guitars, a nylon-string, and an electric. All are good brands, well maintained, with good strings, and have been set up by my local luthier. I simply cannot get them to play in tune all the way up and down the neck. No matter how carefully I try, some of the notes always just sound out, especially if I play with other instruments. What am I doing wrong? —Susan Richardson I feel your pain. So many parts of a guitar’s tone and vibe are subjective.