Hey guys, I'm new to the modes and am still unsure why some song would be labeled to be, for example, composed in G Mixolydian when it uses all the same notes as a C Major/Ionian scale. Why use two different names for two scales that have the same notes?
Sure, if you play them up and down, there is a difference in sound, but in a song, you don't just walk the scale up and down, you take the notes and juggle them around to create a more complex melody, so from the example above, if I say the song is G Mixolydian, is it or is it not (and why so) the same as if I said it is in C Major. How do I know, and how does it exactly matter, if the song was composed in C Ionian or D Dorian, E Phrygian, etc.?
I know this must sound nooby
it's just that I don't see clearly what difference there is.