Highlighted by the timeless Joe South gem "Hush," Deep Purple's 1968 debut was a massive success in North America, if not in the band's U.K. homeland. Following the guidelines of prog and psychedelic rock, Deep Purple had yet to become the seminal influence on heavy metal they'd be known as, and with the vocals of original singer Rod Evans a far cry from Ian Gillan's high-flying gymnastics, fans may be a bit surprised by Shades. Still, Ritchie Blackmore is playing guitar, so prepare to have your mind blown.