Hard Rock
In reality, the difference between "hard rock" and "heavy metal"
is a fine line, and widely open to debate and interpretation.
To these ears, hard rock really seems to be the more radio-friendly
version, while heavy metal opts for a more sinister, darker sound.
Practically every band in the so-called glam or hair genre probably
slots in hard rock, and many debate about whether such bands are
really metallic or not (the number of glam bands on this site
gives a clue as to this author's opinion).
Nonetheless, there were and are many bands not in the glam arena
that are best described as hard rock, and many of them have
sufficient crossover appeal to belong on a metal site.
