Conception - all their stuff especially in your multitude, flow was commercial sounding but still good
Into Eternity - Progressive Death Metal 60% clean vocals 40% death vocals 100% killer
Gracepoint - progressive thrash with a singer that sounds like scott weiland a bit. Very very good music, lyrics, and singing
Lemur Voice - Progressive metal with a lot of jazz influences. too bad the stuff is hard to find and the band broke up.
Zero Hour - Progressive Technical Metal. Amazing music and singing and lyrics. The band is not a fan of the chorus. (they soon will have a forum here)
Archetype - Progressive metal - amazing amazing level of musicianship but the singer is ok but he can be much better
ARK - progressive metal - has guitarist from Conception and many different influences in the music. Too bad Jorn (the singer) left.
Dead Soul Tribe - has the singer from psychotic waltz on it and the music is somewhat similar to tool. Still very good stuff.
Pain of Salvation was already mentioned, but if you want their metal stuff go to Entropia or One Hour By the Concrete Lake
Spiral Architect - they dont call themselves prog they call themselves technical metal, but still amazing stuff. for their time signature stuff im sure they just rolled a d20 to figure it out. not one second of 4/4 time on this one (well, maybe thats an exageration).
Theres other stuff i like, but you said progressive and i hope this helps you
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