Lets say you have a bunch of chords you play a melody over. If the melody notes are a part of the underlying chord it sounds more consonant.
But if the melody notes over the chord, are not a part of the chord, they essentially change the harmony (add extensions).
Lets say we have a G minor chord, and the melody note A occurs, it basicly changes the chord to Gmadd9, even if it's for a brief second.
Is this a valid way of viewing things? Or am I over analysing?