All guitar scales come from one place…
The Circle of Fifths – it’s not just the origin of guitar scales, but music theory as a whole. As soon as you start learning about music theory, you’ll be presented with this chart – chances are, you’ve seen it already. There’s plenty of resources out there for learning how to form chords and scales based on the concepts that the circle of fifths presents, but with applications like the one above (and the guitar chords app), there’s no manual work necessary these days.
Why Should I Use the Circle of Fifths if I Can Memorize the Guitar Scales?
It’d be very difficult to memorize all of the note progressions for every scale, so I would advise against going that route. But considering the amount of music and inspiration that one scale can create, and the fact that most musical genres rely on a few key scales, you’d very likely be able to write and improvise music with just a few progressions memorized.
Having a strong visual understanding of your guitar’s fretboard will make the process even easier – if you’ve memorized that the C Major scale progression is C D E F G A B, and you know where the octaves of each of these notes lies, then I’d say you’re thoroughly prepared to make music.
But learning the circle of fifths provides you with some important abilities that go beyond memorizing patterns – transposing music, writing songs in key signatures, knowing the chords that will be theoretically compatible with a particular scale (and vice-versa), or just figuring out the key of a song.