Imagine that theme without that chordal shift. This is triad theory in action. Of course, not all triads have to be chords of C major or minor. You can use the process, of selecting the 1st (root), ...
This is triad theory in action ... Try moving your triad up the scale as a block chord, just using the white notes of C major. Be sure to maintain the full triad shape. You’ll hear the ...