Originally Posted by: jimiI want to play progressive metal songs~is there anything
to be notice and practice on?
what's the music theory that I should know for progressive
metal?

Well, progressive metal /rock is not easy to play. you have to be quite a season player to play this kind of music.

As an example, you can hear Dream Theater, Rush and so on.

There are many chord changes, and if you are a lead guitarist, make sure you do not only focus on guitar solo only, make sure that you really learn the guitar well.