Diatonic - chords that are within in a key signature. Like in the key of C, the chords Cmaj7, Dmin7, G7, and Gsus, and some others, would be diatonic. So a diatonic passage would be like going through a set of chords that fall into the key signature (they dont have accidentals)
Thanks, that helps, these instruction books don't say much. Any recommendation for Musical reference books? Thanks
Well if you mean reference like theory books, then one comes to mind. "The Jazz Theory Book" by Mark Levine is really good.
Another great book is "The Musician's Guide to Reading & Writing Music" by Dave Stewart (GPI Books). It's comprhensive, easy to understand and even funny. It was only $10 when I bought it a couple of years ago from Hal Leonard.