As a jazz player, almost half of what I do is phrasing - articulation, trying to sound like horn players, etc... And there's a specific style of phrasing that needs to be applied to swing music - you need to pick on the "and" of the beat, and slur (hammer or slide) onto the downbeat. There are books all over the place for this stuff for horn players, but very few for guitarists. So, I've resorted to using the horn books.

In fact, I'll be applying to music schools very soon, and a lot of them require a bebop head be played, just for the sole purpose of listening to phrasing.