Back in the 1970s, the terms "heavy metal" and "hard rock" were often used interchangeably. Groups such as Black Sabbath, Deep Purple, Led Zeppelin, AC/DC and even Motorhead and Judas Priest were all lumped together. It was only in the Eighties that the labels became more clear, especially after the rise of thrash metal.
Our question for you this week: What is your favorite hard rock/heavy metal album of the Seventies? Vote for whatever album you want, just as long as it came out sometime during that decade. We'll accept LPs by Aerosmith, Kiss, Black Sabbath, Deep Purple, Van Halen, Blue Oyster Cult, Thin Lizzy, Alice Cooper and pretty much any other album by an act reasonable people consider hard rock or heavy metal. Just please only vote once and only for a single album.