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The term "Progressive Rock" doesn't define a music style, it defines all the experimental music generes executed, mostly, with instruments asociated with "pure rock" (guitar, bass, drums), adding keyboards, in a compositive instumental style clearly ecletic. Its the combination of the psychodelic and clasic rock.
This is what crearly defines Arbol9 music.
You con check them at their space http://www.myspace.com/arbol9