#2
Speed picking? as in tremolo picking?

if you're writing a death metal song it seems to work most of the time (add in a slower breakdown somewhere)
#4
It can be a little boring an some times even have a really negative effect to the song. But if you do it right it sounds killer. Just listen to Slayer - Rainning Blood, maybe not speedpicking, but damn fast. And sounds awesome!
#5
yeah it works great for D metal but you have to change the song up a but with slow parts or simple power chords
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