On June 3rd, 1970 Deep Purple In Rock was unleashed. It was the band's fourth studio album and fifth overall in just under two years. It was the first studio release for the legendary Mk II line up (the live Concerto for Group and Orchestra was released just six months prior, but that's another song) and despite not receiving the lion's share of post-2K resurgent popularity which their peers have, Deep Purple In Rock stands monumentally as an icon of first generation hard rock and a blue print of the future for the genre of heavy metal.