I was just playing the piano and came up with a little tune I liked and wanted to expand on it but I'm just playing by ear with what sounds good so it's taking quite some time.
I only really know the major scales at the moment and with the notes I'm playing it doesn't fit into any of them. I'd rather be able to work it out for myself than someone just telling me I'm playing in this scale but if you want the notes I'm playing I can give them.
It COULD be the scale of ALEXH7686!
There is only one rule to any scale: it keeps to its own logic across all key signatures. Or so I believe. Someone probably broke that rule already and I'm too noob to know.
MAJOR goes : W-W-H-W-W-W-H
(W=whole step=going over two keys/H=half step=going one key up)
You can work it out by seeing how you progress on C Maj across one octave.
MINOR is merely the MAJOR scale shifted down 3 H(alf steps). C Major is A Minor…. or is A Minor actually C Major?!?
MINOR goes : W-H-W-W-H-W-W (note the same pattern as Major, merely displaced along the keyboard).
Each Major has a Minor equivalent. Easy, yeh? Minor is said to be the 6th MODE of Major: start on the 6th not of the Major and you have the Minor (or drop back three H and start the major there. Same thing.)
There are then 5 other modes of that type of scale. DORIAN starts on the second note, etc. You play the same scale, but the D Dorian is just C Major.
Those are your very basic scales. Next come trickier ones with a different spacing of notes. BLUES scales, MELODIC scales, DIMINISHED scales, etc.
And, you can make your own. Just do it. But, be consistent. You might be able to just be forgiving and say "I'm using a G Major with an E flat thrown in for goodness." There's probably some name for that already, like G MAJ Dim-6 or something.
Make it sound good, but create your own logic for how to play it. It's YOUR reality you are laying down for the listener. Just make sure it has a logic so it doesn't become atonal or too dissonant. Unless you intend to make it so.