1)Dream Theater. dubbed the most popular band you've never heard of. Amazing Musicians. all 5 members virtuosos at what they do.
2)Liquid Tension Experiment. Instrumental group. 3/4ths Dream Theater. it was a side project.
3) Opeth. Once you get past the growling parts, the singer is actually REALLY good. fantastic musicians.
I could go on and on, but i'll stop. i need to go to bed anyway. PM me if you want more.