The Gibraltar Encyclopedia of Progressive Rock (GEPR) is designed as a reference for you to discover bands that are unfamiliar to you and to broaden your listening horizons. It is assumed you are already familiar with the "mainstream" or "big-time" progressive bands, such as Genesis, Yes, ELP, Pink Floyd, Jethro Tull, Marillion, and King Crimson, plus a few others, and are looking for new territory to explore.