Lemme first state that im a huge queensryche fan!!!

Im not saying hes one of the greatest.. but Michael Wilton is a very underrated guitar player. I mean he wrote a good portion of there earlier material and is great live. He wrote a good chunk of the music for operation mindcrime and the warning (which are great albums) and he mainly wrote there heavy riffs. And i have heard him play off camera.... and he can shred like anyone else can ( not like Yngwie or Pertucci).

Also Ritchie Blackmoore for deep purple.... i mean he was really great for his time... so give him a good listen too.