Originally Posted by: Lao_Tzui totally get the last bit its what sounds good to you and feels gd over those chords that makes the song work. so just a recap all the modes are the same but when i play the mode inion the shape differs from aelion and they sound different but yet u say they use the same notes? how can this be. because there is minor and major modes. dont they have different notes to each other? from the minor and major. is the difference just purely from starting at a different root note?.

Yes... The scales contain the same notes - D Dorian is just a C ionian scale using the second note (D) as the root.

The change in intervals results in the different sounds...

C Ionian and A Aeolian share the same notes - Am is Cmaj's relative minor.