I’ve been playing around with my guitar and I chose 7 different notes to create a scale. I played around with those 7 notes and I came up with some riffs that I really like and they sound “new” to me and very different from everything else I’ve been listening to. So my question is, is that really a scale or is it just 7 random notes. Does there have to be some kind of a rule so it’s actually considered a scale? I know that a scale should have 7 different letters ( example: C major scale ( C,D,E,F,G,A,B ) but in my case it doesn’t. Even if i make it a sharp or a flat scale it still doesn’t have 7 different letters.