ARE YOU CRAZY?!?!?!
Darth Plagueis was the master of Darth Sidious, and Sidious died before Kylo Ren was born. What even gives you the idea that Darth Plagueis is Snoke? Darth Plagueis and Snoke are completely different time periods.
Your John Williams music, I agree is very similar. Which means a lot from a boy who is in band! I do believe that evidence means that both were intimidating and seductive.