First, do modes of the melodic minor scale abide by normal keys? I mean, are there ways to play a melodic minor scale with one sharp, then two and so on, and, are they the same sharps as is normal? For example f# and then F#,C#? Second, my understanding is that you have a couple different options of scales when playing over a given chord most of the time. But if the notes of each scale you play over the same chord stay in the same key does it matter if you're playing a different scale? Because you only have 7 options (plus octaves) to choose from. Forgive my musical ignorance, B!