#1
i made this riff the othher day in drop d and i thought it sounded really awesome, but this morning i turned on Liquid metal on xm radio and my riff sounded just like the song "spheres of madness" by decapitated.

e|------------------------------
B|------------------------------
G|------------------------------
D|-----------------5-2---------
A|55-2-5-1--5-2----5-2-3-2
D|--------------------------3-2

i hope it isnt it
#2
It's quite similar, but the thing that separates "Spheres of Madness" is it's rhythm, so depending on how you play that, you may be able to get away with it.
Get baked, study theory.

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Why are you bringing Cm into this?