The chords in the background obviously dictate the tonality of a given major scale mode, so they are equally important when commanding different modal sounds. All this info is in expanded on in detail in Guitar Super System and you can also look through the Music Theory playlist on my YouTube channel for more videos on major scale modes, plus tons of other tips and lessons.
Related Lessons
The Major Scale is very simple to recognize. It sounds exactly like the childhood song “Do, Re, Mi.”