I have played guitar for many years, mostly rhythm...I've learned by ear, watching others and what people have shown me. I do not raed music and have a very small understanding of theory. That being said, I looked up some scales on a internet piano site. Here's my querry, for example, the harmonic minor scale was; C/D/Eb/F/G/G#/B/C, the Mixolydian was; C/D/E/F/G/A/A#/C and the Phrygian was; C/C#/Eb/F/G/G#/A#/C, my problem is this, these scales are obviously in the key of C...right. Are scales always shown in the key of C, and the manner that they are used depends upon the key that you need to play them in, adjusting the scale to fit the desired key, or were they shown to me in the key of C, due to the fact that it was a piano site and not a guitar site? Also, when they say, key of C, is that the normal/most common key? Because, if the first string is the E string and the sixth string is the E string, and when both are played open, it is the note of E, then how/why is it considered the key of C...I don't understand, as I said, if the first and sixth strings open notes are E...why isn't it the key of E, instead of the key of C. I tried to explain this the best that I could, if anyone understands this/my madness...please help! Thanks...
C is easiest to show in notation, due to the placement of the root on the staff, & having no sharps or flats in the major pattern.
Just remember that the PATTERNS are the same up & down your neck, & you'll do fine, as long as you can find your root.
Scales can be shown in any key. The book I have by Ted Green does 'em all in D.