Here are some heavy metal riffs I came up with in different keys using the Harmonic Minor Scale (what I refer to as the Heavy Metal scale, as it is used ofter in heavy metal music).
The scale is the same as the minor scale, except with a sharp 7th.
For example, the heavy metal scale in Am would be A, B, C, D, E, F, G#.
I came up with eight riffs all together played in different keys, enjoy!
The g# is the raised 7th, he said he was using the harmonic minor scale, which as it's said above, it's the same as the minor, but has a sharpened 7th,