By the 1960s, the post-hippie music that was labelled "progressive" (i.e. "progressive pop") would later come to be known as progressive rock, pushing the genre into greater complexity while retracing the roots of romantic and classical music.
The post-hippie music (i.e. "progressive pop") would later come to be known as progressive rock, pushing the genre into greater complexity while. This was by the 1960s. This greater complexity while is retracing the roots of romantic and classical music. This post-hippie music was labelled "progressive".