Is there useful reading out there that identifies the pitches that determine a chord's harmonic function? If so, can you point me in the right direction? The last music theory book I read was around 40 years ago and I don't remember it going into detail about how including a flatted seventh or a raised fifth effected the harmonic function of a chord, but it seems as though it's probably been well covered already, no? Playing around with it, I noticed all kinds of interesting things: Add a Major 3rd to any Minor chord voicing and viola! It's Dominant. Add a Minor 3rd to a Dominant chord and viola! It's still Dominant! Add a raised 5th to a Major 7th chord and now it's Dominant. Add any pitch other than a Major 3rd to a Minor chord and it remains Minor. Add a flat-9th, Minor 3rd, raised 5th, or Minor 7th to a Major chord and it'll sound Dominant, although a Major chord with both 7ths will sound weakly Dominant, it still resolves to it's tonic. I used to think of Diminished chords as having a Dominant function, but now I'm hearing them as a specific case of Minor. Am I tricking myself? Augmented chords can function as the tonic, but their sound is Dominant. Especially a Major 7#5. Dominant chords serving as the tonic, as in the blues, doesn't provide much of a resolution.