#2
besides hardcore tremelo picking, arpeggios, and harmonics i can think of no other needed skills for metal. as long as you know your harmonic minor scales
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#3
Learn all variations of the minor scales. And throw in some tritones; those will always grab attention.
#5
For the love of God though, whatever you do, don't just doodle up and down the scales... listen to Death Metal bands that actually write decent solos...

For example, Drop C grunging away some morbid slaughtering of third world country children... and you step up to solo you come at us with some kind of furious barrage of sinister note-ness..... then you doodle up to the higher notes and everything dries up and the sun comes out.... as if we are going mach 5 through the clouds...then doodle back down to earth where an A-bomb goes off and faces are melting and whatnot......yeaahhh.....

kinda like Dethklok....
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