Both of these country-bluegrass hybrids by James King and Alan Jackson share a devotion to craft. Both albums feature impeccable arrangements for mandolin, fiddle and banjo. Both employ the singer Don Rigsby for harmony vocals. It’s hard not to give the edge, however, to King’s Three Chords and the Truth. His album contains that extra splash of vinegar, that additional twist of tightened emotionalism, that gives both bluegrass and country their distinctive kinds of artistic truth.