Power Metal is the description for today's "true heavy metal" sound. Power Metal bands are always guitar driven, with keyboards rarely making much of an appearance. The vocals are of the clean sounding variety, and usually feature very powerful, talented vocalists who can really reach the upper ranges of the vocal spectrum.
Generally, the songs are fast paced, and employ fantasy themes including (but not limited to) dragons, gladiators, warriors, valhalla, Lord of the Rings, polished steel weapons, and generally conceptual themes that deal with very "manly" concepts, at least in a historical sense. You will rarely find songs about love, sadness, or failure.
Power Metal is very uplifting, powerful music, that appeals to people who like to get inspiration from their tunes. Catchy, epic, and generally enjoyable as hell, Power Metal is a great genre that, regrettably, far too few people know about.
Lost Horizon is the finest example of power metal in the world today.