Regarding the 7.19.17 6:32AM question about what defines a chord... you can give a group of notes many different names, the main thing is to look at the context. What chord comes before it, what comes after? What notes are the other instruments/singer playing at the same time you're playing your chord (the bass player has the power to change a lot of chords if he/she wants to and the "melody instrument" can add extensions). It doesn't really matter what name you give the chord, but if you're writing a piece of sheet music or something.. I'd give it the name that I think makes the most sense in the full context of the song.
ah, that's seems reasonable, and downright sensible