Progressive rock has been know to incorporate elements from several different music styles.
In the 70s, it grew out from elaborate arrangements, mostly derived from classical music, and a balanced mixture of acoustic, electro-acoustic and synthesized instruments. The music structure was by no means simplistic and the songs had a touch of grandeur, an epic feel, and were so long that very few ever got any airplay. The big names in this front were Genesis, Yes, Renaissance, Rush, Pink Floyd and Emerson, Lake and Palmer. Surely, there are millions of people in the world who adore the prog rock of the 70s and to this day swear there is nothing better under the sun. The whole point of this page is to plead guilty to the accusation of, in some sense, having converted to fan of a couple bands that carry a strong element of progressive rock.