I’ve been working on identifying intervals and practicing hearing the 1st, 3rd, 4th, and 5th from a specific key. I understand that scale degrees are essentially just intervals from the tonic note.
I’m trying to understand where I should spend my time. I’m a guitar player and my goal is to be able to improvise over backing tracks - aka hear a note in my head and be able to play it on the board without hunting.
My question is - do I need to be able to recognize chord changes and identify those chords in order to utilize scale degrees? If I’m in the C major key I can identify 3rd 4th and 5th. What happens if the chord is G Major (a chord within C major) instead of C major itself? Am I still comparing the note relative to the tonic of the key which is C, or at that point should I be thinking of the note in relation to G?